A Journey to the End of the Universe


our universe is one of immense and
inconceivable scale punctuated by at least 70 sextillion stars, oases of light
permeating the dark there are more stars in our universe than there are grains of
sand on every Beach on earth it’s an absurd number that defies human
comprehension yet despite this abundance of cosmic landmarks there’s a certain
irony that we live in a universe where the outposts of concentrated matter are
few and far between if each star were indeed shrunk down to
the size of a grain of sand then the typical separation between each grain
would be about six miles so that’s sort of the distance from here at Columbia to
downtown Manhattan in the Greenwich Village
now that distance which is about four light years coming back to physical
units is so great that represents an immense challenge to our modern
spacecraft for example it would take our most remote spacecraft Voyager to
another 80,000 years to traverse such a distance and that’s just an nearest star
the nearest galaxy is half a million times further out than this when faced
with such epic distances such timescales it seems like the universe simply
forbids the dream of human astronauts ever exploring the depths of space like
a cosmic joke teasing us with jewels of exploration which will always be out of
reach and it’s at times like these that we
tend to dream of other solutions based on exotic physics such as warp drives or
wormholes but to the best of our knowledge these are theoretically
implausible what about using real proven physics in our recent videos we
discussed the halo drive as a possible means for interstellar travel
but even that system isn’t fast enough to get you to other galaxies remarkably
there is a trick using proven physics that might allow a person to travel
between even distant galaxies on a human lifetime but like making a deal with the
devil it comes at such a steep price that you might not be so quick to want
to sign up a cost that emerges as a natural consequence of Einstein’s
special theory of relativity today we’re going to be taking a trip onboard the
constantly accelerating spacecraft let’s imagine that we have constructed a ship
capable of accelerating at 1g for as long as we like that means that its
velocity increases by 10 m/s for each and every second that ticks by so for
example after 10 seconds it will be traveling at 100 meters per second and
have covered a distance of half a kilometer we’re just going to leave
aside the issue of how a spaceship could actually conduct such a feat for the
moment and just assume it is true and that’s simply for the purpose of keeping
this video focused and on point and similarly we are going to assume that a
spaceship has perfect shielding capable of withstanding any kind of impact or
radiation you can imagine one benefit of the constant acceleration would be that
this would push the crew back towards the rear of the ship with the same force
that the earth pins us to the ground thereby creating artificial gravity
something we’ve discussed in our previous video in much more depth and so
life on board would be relatively Pleasant working
much like we do here on earth a ship that undergoes constant acceleration
starts out slow but gains evermore momentum over time as its voyage
continues so this is a bit like compound interest your gains looks more to begin
with but over a long period of time those gains rapidly accumulate after
just two and a half hours we would have sailed past the moon after one and a
half days we’d be at Mars and after three weeks we’d have overtaken voyager
two and left the solar system altogether by this point a ship would be traveling
at 40 million miles per hour or about 6% the speed of light
that’s far faster than any spaceship we built has ever traveled before it’s fast
but it’s not fast enough for ayan Stein’s theory of special relativity to
really come into play yet as we leave the solar system we head out towards an
nearest star system Alpha Centauri and see it gradually increase in brightness
as we approach whilst the Sun rescinds into just another speck of light behind
us the next year is fairly uneventful life on board is probably rather mundane
as the days weeks and months tick by yet with each day your ship travels about
two million miles per hour faster than it did the day before it’s now
impossible to have a live conversation with your friends and family back on
earth the time it takes for radio waves to travel back and forth is now many
months yet the loneliness is somewhat alleviated by regular letters from home
updating you about the latest family news sports results scientific
breakthroughs and political scandals back on earth after 15 months into your
journey your crew celebrates crossing the first light year you’re now just
under one-quarter the distance to Alpha Centauri but over a third
the way in terms of outbound journey time and that’s thanks to the ship’s
constant acceleration there’s another milestone that you and your crew realize
you have passed as well and that’s what physicists caught your Lorentz factor
given by this famous equation right here has now passed a factor of two that
means that the time dilation between you and earthbound observers is now a factor
of 2 and thus earthbound observers would seem to see you moving in slow motion on
board the ship from this point on Einstein’s theory of special relativity
will have an ever greater influence on you and your ship that’s because you are
now traveling away from the earth at 87% the cosmic speed limit the speed of
light now if there were no such limit then you should expect to cross the
speed of light in 45 days time but Einstein’s theory a theory which has
been rigorously tested and proven back on earth states that nothing can move
faster than the speed of light moreover all observers no matter what their speed
will always observe the speed of light to be the same now this is very
non-intuitive if a horse chases down a moving train then the train appears to
be moving slower than usual from the horse’s perspective but relativity says
that no matter how fast that horse is running if the train is a beam of light
then it will always appear to recede away at exactly the same speed the speed
of light the horse can never catch up if the speed of light is a constant to all
observers then the mind-bending consequence is that space and time are
not constant they shift to accommodate this rule and that’s exactly what
happens here with our ship time shifts such that observers back on earth seem
to see the crew moving slower than usual on board and even space shifts such that
the ship itself appears squashed in length
both of those effects scale with this famous Lorentz factor which at this
point in our journey is a factor of two this even affects your perceived
acceleration from Earth’s perspective you are now no longer accelerating at 1g
but rather your acceleration appears to be getting ever smaller as you approach
the speed of light despite the fact onboard you still feel a 1g acceleration
on board the ship of course you and your crew would not think anything had
changed time appears to be running just like usual but you would notice some
strange things outside of the ship looking back at the Sun you’d notice
that it would have appeared to have faded into darkness much faster than
you’d expect from simple distance scaling by the time your Lorentz factor
is – it’s now 10,000 times dimmer only detectable with the ship’s onboard
telescope as a result of relativistic aberration and time dilation affects not
only this but light from the Sun now appears increasingly red shifted due to
the relativistic Doppler shift so red in fact that it now emits mostly in the
infrared band where your eyes can’t even see it but ahead of you that opposite
has happened Alpha Centauri now appears 10,000 times brighter than it would if
you were not moving yet most of its radiation is now arriving as high-energy
ultraviolet light not only this but the constellations ahead of you would appear
distorted warped into a kind of tunnel vision illusion in a very real way as
you accelerate ever faster you begin to disconnect from the rest of the universe
but accelerating forever is not an option because we don’t have infinite
fuel onboard and at some point we’re going to want to slow down step off the
ship and reconnect to the rest of the universe so one way of doing this is to
accelerate your ship up to about the halfway mark in your journey and flip
the ship over on its head and accelerate in the opposite direction thus bringing
you to a stop at some distant desk nation now let’s stick with our original
destination as Alpha Centauri which is 4.4 light-years away remember that this
means that a beam of light emitted from Earth would take 4.4 years to reach
Alpha Centauri yet because of the time dilation effects on board you would land
your ship on one of the Alpha Centauri planets having aged just three and a
half years don’t worry you didn’t outrun a beam of light here because according
to clocks back on earth the journey took you six years maybe you spend a few
weeks exploring this new planet then head back on board and make the return
journey home when you get back home about seven years would have passed for
you but 12 years for everybody back on earth not about timescale to complete a
journey to the nearest star recall that your ship started
decelerating at the halfway mark two point two light-years from Earth
that would be about 1.8 years into your journey from your perspective at which
time your ship would be traveling at 95 percent the speed of light let’s imagine
that a fight broke out on board and the crew decided they didn’t want to go to
Alpha Centauri anymore they wanted to use all of this momentum
to go further far further than anyone dreamed of now remember we’re
considering here only round-trip scenarios we’ll relax that assumption
later but for now any journey is defined by four phases outbound acceleration
outbound deceleration inbound acceleration and then inbound
deceleration with that in mind record that a round trip to Alpha Centauri
would take seven years for the crew but now let’s go further out our son lives
within a region of space of slightly higher hydrogen gas density than usual a
region about 30 light-years across and playfully known as the local fluff a
ship which makes a trip to the edge of this local fluff wood age thirteen point
four years during their adventure upon return they’d find that their children
were now older than they were having aged those thirteen point four years
plus another 50 giving rise to some strange reunions believe me
but I knew you’d come back yeah because perhaps the crew are not
satisfied with just leaving this local fluff though perhaps they vote to go
further the local bubble is a larger volume in which the local fluff itself
resides a collection of tens of thousands of stars spanning 300
light-years across in a 1g spaceship the crew will be able to fly to the edge of
the local bubble and return back and only 22 years would have passed for them
but by the time they return to Earth they would be historical relics as six
centuries would have passed back on earth perhaps the crew would be shocked
and alienated by the changes which had transformed society in those six
centuries gone by let’s go further and set a round trip to leave a galactic
spiral arm the Orion spur for which the round trip would take thirty-one years
for the crew this is where things get weird remember that your journey is
characterized by four phases and at the end of that first phase of acceleration
you’re hitting your peak velocity so if you’re journeying out to the edge of the
Orion spur that first phase would take you about eight years but after about
six and a half years you and your crew would look out of the front window and
you would see something very strange two-thirds of the way into your seventh
year of travel a small patch of the sky ahead looks like it’s glowing red at
first you think the eyes are simply playing tricks on you after so many
years in space but then you realize that your Lorentz factor by now is 650 and
the left over radiation from the Big Bang
the Cosmic Microwave Background has now blue shifted all the way from the
microwave to visible red light over the course of your now final year of
outbound acceleration you and your crew are amazed to see this small patch of
the sky ahead grow ever brighter ever bluer until at its peak velocity it’s
like staring down into the eye of a cosmic rainbow as if the ship has now
finally caught the gaze of the universe itself perhaps not satisfied with leaving the
Orion spur you instead choose to journey to the edge of the galaxy itself a round
trip for the crew at 41 years having returned home from their 100,000
light-years rip the crew now in their 60s would return to an earth which had
witnessed a hundred millennia pass by it’s very difficult to imagine how
humans would have changed after such a long time scale perhaps our ancestors
would look different after so many generations of gradual evolution perhaps
they would speak completely different languages to the ones we recognize today
maybe they would have even abandoned technology and gone back to a more
Neolithic way of living maybe even the earth itself is abandoned at this point
and there are no trace of humans on the earth at all whatever happens at this
point the ship’s computer database very likely represents an ancient library
containing information long lost to the eons of time back on earth but all of
this is still within our own galaxy what if we go truly to the beyond to another
galaxy or together let’s go to Andromeda in a 56 year epoch round trip you and
your crew returned in old age to earth having borne witness to another galaxy
firsthand but back on earth there is very likely no one even recognizable as
human by this point with five million years having passed by you and your crew
are very likely the last humans in the universe although there were no humans
left the earth looks better than you’ve ever seen it before biodiversity has
almost recovered to pre-human levels coral reefs have recovered across the
planet and cities and concrete have disappeared as Nature has now reclaimed
what was always hers if we wish to venture further afield than Andromeda
then we may start to need life extension technologies for the crew voyaging
beyond our cluster of galaxies the Virgo cluster would require a round trip of 67
years for the crew the Virgo cluster lives within the Laniakea super cluster
of galaxies a region of space spanning hundreds of millions of light years and
containing tens of thousands of galaxies your round trip now would take 76 years
heat velocity during that journey your Lorentz factor would be 250 million a
speed of 0.9 9 9 9 9 9 9 9 8 times the speed of light by this point the Cosmic
Microwave Background will have appeared to have increased from his ambient 2.73
kelvin temperature to over a billion degrees kelvin that’s the temperature
that the universe was after just a few minutes after the Big Bang itself
needless to say this would be an extremely hazardous radiation
environment for you and your crew not to mention the now ludicrous shielding
requirements to protect against impacts sometimes he hear it said that as you
get to relativistic speeds the momentum of the ship increases so much that that
somehow protects it from impacts but from the perspective of the ship it is
not moving it is the particles the space debris out there that has the extreme
momentum and thus collisions with these tiny particles would not be for the
faint of heart after completing your 76 year round trip to the edge of the
Laniakea supercluster your home system would be barely recognizable landing on
earth continents would have shifted into unfamiliar positions the surface is now
devoid of plants or animals and you can no longer even breathe the air around
you over the last billion years the sun’s
luminosity has now increased by almost 10% which in turn has increased the rate
of weathering on the earth that weathering has removed carbon dioxide
from the atmosphere so much so that photosynthesis is now no longer possible
ending the rain of plant-based life ceasing oxygen production and collapsing
the food chain by this point even plate tectonics may have shut off as water
evaporates from the Earth’s surface these would be the last days of
multicellular life on earth beyond this point only simple microbial life will be
able to cling on to existence for maybe a few hundred million years at best the
living Earth is gasping her last breath and so I think it would be a mournful
return to come back to your home planet and see it not go out with a bang but be
suffocated with a slow drawn-out cruel death perhaps reminding you of the fate
which likely awaits yourself as now even your own body is feeling the effects of
time one might suggest that there’s no reason
why Laniakea should be the limit to these types of round trips after all the
time dilation is now so extreme that we can travel exponentially further with
each passing year indeed you sometimes hear it claimed
that we can even travel to the edge of the observable universe using constant
acceleration those are galaxies some 46 billion light-years away from us but no
matter how much we accelerate no matter how extreme time dilation becomes we
will never be able to reach the edge of the observable universe now why should
this be well when we talk about journeys of billions of light years then the
expansion of the universe itself starts to interfere with our voyage in 1998 two
teams of astronomers used distant supernovae to independently discover
that the rate of the universe’s expansion something known since Edwin
Hubble’s time was in fact increasing it was itself accelerating we do not fully
understand why this is happening but the cause is usually labeled dark energy
using these measurements of the rate of the universe’s expansion we can define
various thresholds various horizons which limit our interactions with the
outside universe for example the so called a particle horizon is the
greatest distance which a particle of light could have traveled since the Big
Bang itself essentially which was 13.8 billion years ago
now you might naively think that that means the distance should be 13.8
billion light years but because of the expansion of the universe it’s actually
a much greater distance ends up being 46 billion light years across now coming
back to our spaceship adventure if I want to make a round trip over cosmic
distances then this expansion causes the distances between regions to gradually
grow do your in my trip meaning I have to
travel further than I thought I did now this isn’t important if you’re
traveling within a gravitationally bound region like a galaxy say that resists
the expansion but it is very important as we voyage beyond a galactic super
cluster as far as I can tell there is no previous mention or calculation of a
round-trip horizon in the literature but we should be able to calculate it by
solving the following set of equations I’ll link to a paper down below where
you can learn all about how to do these kinds of calculations yourself but to
save you that pain the resulting proper distance turns out to be eight point
three billion light-years away this distance represents a cosmic point
of no return once you cross it there’s no coming back you would never be able
to get back home even traveling at the speed of light and that’s because the
expansion of the universe simply outpaces you and yes space can and does
expand faster than the speed of light so it would be a strange feeling on board
the ship as you cross that threshold knowing that no matter what happens from
this point on you would never return home and see the earth again since we
can’t return home beyond this point let’s not even try let’s change the
rules of our trip and make it a one-way ticket now I’m still going to assume
that the second half of our journey is a deceleration phase where we come to a
stop and that’s simply because it’s very difficult to talk about how much time
has passed by unless we return to the same inertial frame of reference from
which we left now liberated from the need to come back home you might expect
that we can travel far far further into the universe perhaps even to the edge of
the observable universe but again the answer is no even if we accelerate
forever we’ll never catch up to the so-called
event horizon which lies at twice the point of
this represents the greatest distance which a beam of light emitted from Earth
now could ever reach in infinite time because parts of the universe are
expanding at the speed of light then we can never catch up to such regions and
thus end up being limited to distances within this so-called event horizon but
what the hell I mean we’ve come this far let’s just keep going after this point
we’re not really a spaceship anymore because no matter how hard we try we
never catch up with the event horizon and in fact the rest of the universe
around us expands away in all directions ever faster soon there are no galaxies
no clusters nothing around us as the universe expands ever faster beyond a
view we’ve become isolated trapped in the void if we’re not really a spaceship
anymore perhaps we’ve become a Timeship could we use a ship to travel to the end
of time itself now certainly if you naively use the equations of special
relativity things certainly do look extreme for example with an acceleration
and deceleration phase spanning two centuries by the ship’s clock a clock
back on earth should have recorded one hundred thousand trillion trillion
trillion years enough time that even protons would have theoretically decayed
to leave no nucleonic matter left but here’s the thing it doesn’t really make
much sense to even talk about time dilation anymore and that’s because time
dilation is defined as being relative hence the name relativity to our initial
inertial frame of reference which in our case was the earth
but by this point after so much time after crossing so many light-years the
earth lies beyond our cosmic horizon we are no longer causally connected to it
but another way it is now literally impossible to compare clocks to those
back on earth to make matters worse not only can you not compare to Earth’s
clocks but you can’t even compare to any other clock by this point that’s because
by now the universe has expanded by a factor of 10 to the 10 to the 55 and
statistically there would very likely be no other particles within your entire
observable universe except for you even the Cosmic Microwave Background has
thinned out to nothing by now how can we even talk about measuring time comparing
clocks when the clocks effectively exist in separate universes by this point the
very definitions underpinning time dilation have effectively unraveled and
so here finally your journey comes to a close in complete isolation a perfect
void you and your crew have become a monument to times that once were to a
universe that once was and perhaps is you and your crew finally pass away into
the night you think back to that fateful day that you agreed to step on board
this vessel to be locked into a tomb that hurtled into nothingness the
universe right now is in its youth we live in its flourishing years with stars
sparkling across the sky and perhaps life to proliferate across the cosmos
this is its golden era and we are a product of it there’s never been a
better time to be alive and there probably never will be again
like all things the universe must eventually end but for now we have a
moment in the Sun summer days to live grow and build by let us use the time
that we have wisely it’s just his place to hook
you pushed away as connected as the person above the
month when you win those you


90 Responses

  1. David Miles

    June 8, 2019 1:07 pm

    Guys, I've made an album inspired by your work. Halo Drive concept is so cool and futuristic that I called my last EP Halo Drive. I think you, Mr. Kipping and your team are dancing sometimes, so enjoy! https://indive.bandcamp.com/album/halo-drive

    P.S. support with likes, guys, so Cool World team see it!

  2. som Nji

    November 4, 2019 2:46 pm

    Don't know about you guys, but the cold shiver that enveloped me while watching this outstanding piece was something of a nightmarish scene from a movie; especially where he said – "there's no going back anymore and you'll never return home and see the EARTH again".


  3. sabih mitchell

    November 4, 2019 6:20 pm

    Out of all the things that have been seen in the depths of our universe, the Human Being is the only thing in all of this vastness, that is conscious of it's self.Not even the speed of light travels as fast as the speed of tbought. So, Who Are We Really ? Great Video !!!

  4. Windhoek

    November 4, 2019 8:56 pm

    I usually don't prefer public posting but this video moved me and it deserve nothing short of a paragraphed response.  This is perhaps one of my top 5 cosmic journey related videos I have ever watched – I subscribed and rang the notification bell already. If only I could widely share this to all my people, this side. Talking about this side, greetings from Africa, or beautiful Namibia to be specific. And cosmologically speaking, I don’t think that is pushing this small developing part of this tiny speck of dust too far. It is certainly not a sh*t hole, as once emitted by a fatal mouth of one member of our specie swept away by ignorance, power and racism. By the way for the novice – Namibia and not Nambia is found in the corner of Southern Africa or the lower side of the planet in its southern hemisphere. Not that anyone cares given the impact of this amazing scientific piece of the cosmic journey under review, but I said it anyway. IMHO though, it is these types of thoughtful knowledge our bipedal cousins who lost melanin after leaving African savannahs a couple of millions, if not thousands of years ago (probably through a stroke of natural misfortune in any case) were supposed to bring back home. I think you can all guess the trajectory I am taking this to…lol. Not colonialization, economic plunder, senseless religions and all sort of rape, slavery and idiotic racism. That is the color of greed and ignorance, of course any member of our bipedal specie that has passed a sanity test can submit that racism is lower than stupidity. Or perhaps merely a comfort zone for some of our mammalians members that only comprehend dominance and pop culture. After observing years of a concerted campaign that paint a bad picture of our continent and people by some of our distant cousins, is it therefore too early or wrong to proclaim that racism is even more ignorant then the false narratives often peddled about my people this side of the planet? Well, more so if the double helix revelation is anything to go by. I humbly request forgiveness of any trace of my ignorance, I live on the ignorant side of the planet or, so it is assumed by some of the mainstream medias. We love freedom that YouTube has created (for that already- what a great time to be alive..). If anyone gets to read this post, please all provocative/thoughtful responses awaited, the opposite view is appreciated too. Of course, including our flat earthers, but no racists, bots or unguided trolls.

  5. soyou noat

    November 5, 2019 6:06 pm

    This excellent presentation has altered time for me. It is well thought out and addresses topics that are often overlooked by many such videos on YouTube. Your narrative is captivating in a way that has me recalling the original PBS airing of Carl Sagan's Cosmos on September 28, 1980. I was 19 years of age and a 2nd year engineering student at a large University, with an emphasis on physics. I was a science based kid from a non-religious family with a solid moral foundation and I was more than ready for the revelations that Carl Sagan presented. I viewed every second of that first season and many of my assumptions about our universe were validated by Sagan's incredible presentation. I look forward to more from you. Subscribed!

  6. Niladri Sarker

    November 6, 2019 3:19 am

    He says, around 26:40. – "is it possible to travel to the end of time?"
    My question is, calculations apart, if per say coincidentally the ship was in the right vectors, then is the ship actually able to reach may be the beginning of time?

  7. Stephanie Murray

    November 6, 2019 9:30 am

    Fascinating ( as Spock would say ) but this is supposing that whilst these astronauts are leaving the universe that no other teams or ships were sent out over the 100,000 years and that they are the only explorers ,,

  8. Babey Pop

    November 6, 2019 2:02 pm

    There is the speed of thought…make the equation and see the solution coupled with herbs to extend lives to eternal we have the answer to our existence as God intended…be wary as a group of rich psychotics know about this and are plotting to kill the human race by 95% which we need to fight against as God intended all of us to live for his purpose which was to colonise the universe xxxx I am the Keeper of the Secret knowledge xxxx

  9. ILikeGamesToo - King of Discord

    November 6, 2019 9:46 pm

    So if we can do this, we can time travel into the future, so how about the past?

  10. som Nji

    November 7, 2019 8:33 am

    Once again, I must say it was a very succinct explanation of the matters concerning the universe.
    Chilling! indeed – especially towards the end.
    Funny enough, after seeing this documentary, I went back to watch INTERSTELLAR – epic.

  11. CoolBlackKnight

    November 7, 2019 10:32 pm

    My man, I ran across this video in my feed one day so I watched it as stuff like this interests/fascinates me. The way you told this story of travel combined with the somber background music was cathartic. It haunts the imagination in a good way. Your voice & cadence is worthy of those many relaxation videos here on YouTube… I even sometimes set my sleep timer to "30 minutes" on my 4k TV and just fall slowly asleep listening to you – as you take me… on A Journey to the End of the Universe. Kudos.


    November 7, 2019 10:51 pm

    After seeing this I'm little more convinced that Hostile Alien Invasion is a little more probable. When you're racking up miles like that you won't have anything to go back to, so you might as well make where ever you go home.

  13. Trw Wn

    November 8, 2019 1:44 pm

    Fascinating but ultimately sobering. Enjoy life in the slow lane on Earth. Have a great meal with friends and loved ones, cherish the sunsets, watch the surf.

  14. proteus225

    November 8, 2019 9:31 pm

    There are a lot of things I can not grasp in this video but the things I really can not understand are the dislikes.

  15. imran ashique

    November 8, 2019 11:17 pm

    I think if such a journey were ever possible, at least the concepts of God and Heaven would have been clear.

  16. joey davis

    November 9, 2019 8:09 am

    Every time he explains things "beyond comprehension" I slap myself.

    Intelligent Aliens would most likely focus on star clusters as well as their own neighborhood of stars.

  17. benmac1977

    November 9, 2019 11:23 am

    Humans are always very optimistic and always from 'theoretically possible' they go straight to 'almost happened'.

  18. Liam White the Nerd

    November 9, 2019 11:33 pm

    Hey, michio kaku said that there is actually more galaxies in the universe than there are grains of sand on earth. Not stars. Just puts an even bigger scale on just how many stars there are.

  19. karambit

    November 10, 2019 7:50 am

    It's not the distance but the amount of high energy particles you will be exposed to when you travel between stars and galaxies.

  20. Adam Sawyer

    November 10, 2019 9:07 pm

    A Void may not be so bad.

    For it is in a Void that new beginnings may occur.

    Why be so certain that the Initiation of Existence is the first; or the last ?

  21. Jaymes Deleeuw

    November 11, 2019 1:35 am

    I'm looking for opinions on this question. I've always thought about what it would look like if it were possible to go to the end of the universe ( or at least were its expanding at) and see what it looks like. I understand that its physically impossible because of how fast its expanding but if u were to slow time down to an impossible slowing what would it look like. Or ever sound like if u were able to hear it. ( all opinions are welcome).

  22. Winterraven

    November 11, 2019 8:26 am

    David's voice can really hypnotize. It's incredible how slow and comforting he speaks of a universe so incomprehensibly larger than us, insignificant grains on an insignificant planet.

  23. John Thijm Thijm

    November 11, 2019 10:22 am

    But isn’t Einstein’s equation not a theory. A theory doesn’t necessarily have to be a fact. In Einstein’s case his theory has yet still to be proven.

  24. Albert C Combs

    November 11, 2019 4:43 pm

    I do find this video interesting because in my own conclusion that we humans are freaks in the immensity of the universe.

  25. Chris Dooley

    November 11, 2019 4:56 pm

    Quite simply one of the best videos and explanation of steady 1g acceleration and it’s exponential affects I’ve ever watched. I’ve shared this with many friends who aren’t ‘science’ people and they all have said that it was not only very easy to comprehend but fascinating to watch. Well done 👍🏻

  26. Will Mind

    November 11, 2019 9:17 pm

    Watched it twice now. Great work! Wonderful spoken. Blows my imagination!
    But one question keeps popping up in my mind: IF we ever could travel at those speeds how could we navigate around a planet or star in our path.
    And would the crew not be overtaken by another ship with even better technology when continuing further (and time on earth has passed some 600 years)?🤔😃

  27. kane lee

    November 11, 2019 11:30 pm

    that is rediculous, we need to do better than this, we need to go 1000 times faster than the speed of light, and dont tell me it cant be done,, because it can.. we need to traverse this universe and others also.

  28. Jonathan William Fay

    November 12, 2019 6:19 pm

    The only way that I would undertake this kind of journey wound be if I’d have the understanding of how to make a dead star back into a living plan again to have a place to exist at its end!!!
    Outer wish there would be noting to live for after the end of this journey!!!
    And all still living humanity wound die after traveling on this starships voyage into the unknown!!!

  29. Remmelt ten Napel

    November 12, 2019 11:50 pm

    After googleplex^googleplex years the spaceship broke the cosmic speed limit and exploded into a new big bang: universe v2.0

  30. Kelly-Charmaine Marie Flanagan

    November 13, 2019 5:15 am

    Wow. I'm thinking I too need some time to let all of this soak in. Absolutely amazing and heavy with import. I love it!

  31. French inSH

    November 13, 2019 9:29 am

    Very informative, the last part is speculative though based on the fact that the expansion of the universe is accelerating and ever lasting which is not sure : the big tear? or the big crunch?. Amazing piece of work !

  32. Stagger Lee

    November 13, 2019 12:32 pm

    I'm going to book this dude to sit with me on my deathbed to gently send me into oblivion. Does he do special rates for Patreon subs?

  33. Will Davis

    November 13, 2019 3:11 pm

    There is a lot of 3 dimensional space with a lot of stuff in it but it can all be measured and counted and no matter how big or how many when given enough time it would become repetitious

  34. Caleb Indiatsi

    November 13, 2019 6:12 pm

    David, this one of the most exciting and educative videos I've ever watched on galactic travel. By combining the equations and video effects you've made it possible to comprehend the basis of your narration. I shall be watching this video again and again.

  35. wateronfyre

    November 14, 2019 12:56 am

    Would be nice if one day an human group from an ancient civilizations arrive on earth telling they made the space travel to a next universe and come back to tell us the secrets of creation!


    November 14, 2019 5:22 am

    I think moving that fast would crush us. It would create its own gravity force and we would not be suspended in mid-air as it travels.

  37. rubber communist

    November 14, 2019 7:05 pm

    I don't know how I ended up here but I am glad I did. This video was awesome. I have subscribed and going to watch more of your videos. I love videos with imagination mixed with science. Thank you. Great video…..

  38. jerrell haynes

    November 14, 2019 10:32 pm

    Don’t make any sense,go the other direction,to center or beginning,becomes imposable,but going with the flow if faster than light is not posable,you said continue gaining speed,so caught in expansion speed you could not gain speed if unable to travel at speed of light you’de be ripped to shreds from the get go by speed greater than light is expanding around you.best to just stay home while somehow still expanding out from creation at faster than light,problem solved,only way to go is stay.

  39. Stan TheObserver

    November 15, 2019 1:57 am

    Even this cold hard slap in the face is..not true. At those speeds..any dust particle hits the ship like an a-bomb. Plus,this "death" is if the Universe goes constant forever expanding…maybe dark energy ends..maybe dark matter doesn't…it gets pulled back together.
    DOUBLE PLUS…we learn to fold space faster than it can expand…like Gods. Entanglement travel..the past is always with reach… .instantly!
    Still,to be on the safe side ..do your bucket list old man. Just in case.

  40. Forbidden Crystal Internet

    November 15, 2019 4:26 am

    I know a lot about cosmology and stuff, but this video still blew my mind. This was fantastic I don't have enough good things to say about it. Definitely got my subscription.

  41. Debbie Judd

    November 15, 2019 7:16 am

    This guy could read the phone book and make it awesomely awesome. Lol. What an accent. Oh yeah . Just no romance novels please. Lol. Not Sexy crap just a really good novel. The money you would make.

  42. Darren Potter

    November 15, 2019 7:54 am

    What a total load of bs….we live in an enclosed system ffs…. Grow up and research flat earth…NASA is a massive fraud. We haven't even been to the moon. EVER!!!

  43. Marshall Ck

    November 16, 2019 1:16 am

    Only for the true God and angels to move with speed… 2019… Yeah… all the fun and good things for the Angels… Yeah…👍✌

  44. Lisa R

    November 16, 2019 2:21 am

    With God nothing is out of reach . Your mindset is not appreciatable on the computer mind your kindly asked to pod cast know more

  45. Shashi Shettar

    November 16, 2019 2:43 am



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