Hang tight while we fetch the video data and transcripts. This only takes a moment.
Connecting to YouTube player…
Fetching transcript data…
We’ll display the transcript, summary, and all view options as soon as everything loads.
Next steps
Loading transcript tools…
The Fermi Paradox — Where Are All The Aliens? (1/2) | Kurzgesagt – In a Nutshell | YouTubeToText
YouTube Transcript: The Fermi Paradox — Where Are All The Aliens? (1/2)
Skip watching entire videos - get the full transcript, search for keywords, and copy with one click.
Share:
Video Transcript
Video Summary
Summary
Core Theme
The content explores the profound question of whether humanity is alone in the universe, examining the vastness of space, the probability of extraterrestrial life, and the perplexing absence of any observable alien civilizations, known as the Fermi Paradox.
are we the only living things in the
entire universe
the observable universe is about 90
billion light years in diameter there
are at least 100 billion galaxies each
with 100 to 1 000 billion stars recently
we've learned that planets are very
common too
and there are probably trillions and
trillions of habitable planets in the
universe which means there should be
lots of opportunity for life to develop
and exist right but where is it
shouldn't the universe be teeming with
spaceships let's take a step back [Music]
even if there are alien civilizations in
other galaxies there's no way we'll ever
know about them basically everything
outside of our direct galactic
neighborhood the so-called local group
is pretty much out of our reach forever
because of the expansion of the universe
even if we had really fast spaceships it
would literally take billions of years
to reach these places
traveling through the emptiest areas in
the universe
so let's focus on the milky way the
milky way is our home galaxy it consists
of up to 400 billion stars that's a lot
of stars counting one per second it
would take you a hundred lifetimes to
count them all there are about 20
billion sun-like stars in the milky way
and estimates suggest that a fifth of
them have an earth-sized planet in its
habitable zone the area with conditions
that enable life to exist if only 0.1 of
those planets harbored life there would
be one million planets with life in the
milky way but wait there's more the
milky way is about 13 billion years old
in the beginning it would not have been
a good place for life because things
exploded a lot but after one to two
billion years the first habitable
planets were born earth is only 4
billion years old so there have probably
been trillions of chances for life to
develop on other planets in the past if
only a single one of them had developed
into a space traveling super
civilization we would have noticed by now
now
what would such a civilization look like
there are three categories
a type 1 civilization would be able to
access the whole energy available on its
planet in case you're wondering we're
currently around 0.73 on the scale and
we should reach type 1 sometime in the
next couple of hundred years
type 2 would be a civilization capable
of harnessing all of the energy of its
home style this would require some
serious science fiction but it is doable
in principle concepts like the dyson
sphere a giant complex surrounding the
sun would be conceivable
type 3 is a civilization that basically
controls its whole galaxy and its energy
an alien race this advance would
probably be god-like to us
but why should we be able to see such an
alien civilization in the first place
if we were to build generation
spaceships that could sustain a
population for around 1 000 years we
could colonize the whole galaxy in 2
million years sounds like a long time
but remember the milky way is huge
so if it takes a couple of million years
to colonize the entire galaxy and there
are possibly millions if not billions of
planets that sustain life in the milky
way and these other life forms have had
considerably more time than we've had then
then
where are all the aliens
this is the fermi paradox and nobody has
an answer to it
but we do have some ideas let's talk
about filters a filter in this context
represents a barrier that is really hard
for life to overcome
they come in various degrees of scary
one there are great filters and we have
passed them
maybe it is way harder for complex life
to develop than we think the process
allowing life to begin hasn't yet been
completely figured out and the
conditions required may be really complicated
complicated
maybe in the past the universe was way
more hostile and only recently have
things cooled down to make complex life
possible this would also mean that we
may be unique or at least one of the
first if not the first civilization in
the entire universe
two there are great filters and they are
ahead of us
this one would be really really bad
maybe life on our level exists
everywhere in the universe but it gets
destroyed when it reaches a certain
point a point that lies ahead of us
for example awesome future technology
exists but when activated it destroys
the planet the last words of every
advanced civilization would be this new
device will solve all of our problems
once i push this button if this is true
then we are closer to the end than the
beginning of human existence or maybe
there is an ancient type 3 civilization
that monitors the universe and once a
civilization is advanced enough it gets
eliminated in an instant
maybe there is something out there that
it would be better not to discover
there is no way for us to know
one final thought maybe we're alone
right now we have no evidence that
there's any life besides us
nothing the universe appears to be empty
and dead no one's sending us messages no
one answering our calls we may be
completely alone trapped on a tiny moist
mud wall in an eternal universe does
that thought scare you if it does you're
having the correct emotional reaction
if we let life on this planet die
perhaps there will be no life left in
the universe life will be gone maybe
forever if this is the case we just have
to venture to the stars and become the
first type 3 civilization to keep the
delicate flame of life existing and to
spread it until the universe breathes
its final breath and vanishes into oblivion
oblivion
the universe is too beautiful not to be
experienced by someone [Music]
[Music]
this video was made possible by your support
support
it takes at least 200 hours to make one
of our videos and thanks to your
contributions on patreon we are slowly
able to do more and more of them if you
want to help us out and get your own
personal bird for example check out the
Click on any text or timestamp to jump to that moment in the video
Share:
Most transcripts ready in under 5 seconds
One-Click Copy125+ LanguagesSearch ContentJump to Timestamps
Paste YouTube URL
Enter any YouTube video link to get the full transcript
Transcript Extraction Form
Most transcripts ready in under 5 seconds
Get Our Chrome Extension
Get transcripts instantly without leaving YouTube. Install our Chrome extension for one-click access to any video's transcript directly on the watch page.
