December 9, 2019
  • 6:42 pm Track 104 Convert to Islam Story | French Musician became a Muslim | Islamic Stereo
  • 6:42 pm The Fate of Islam, Part 2
  • 6:42 pm Episode 2: Your Faith Wears Out | The Faith Revival
  • 6:42 pm The Crisis of Faith in the West – Michael Ramsden
  • 6:42 pm The Creationist Museum Is Failing, And Ken Ham Is Blaming Atheists
The Fermi Paradox — Where Are All The Aliens? (1/2)

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 one hundred billion galaxies, each with one hundred to one thousand 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. But where is it? Shouldn’t the universe be teaming with spaceships? Let’s take a step back. Even if there are alien civilizations in other galaxies, there’s no way we’ll ever know about them. Basically, everything outside 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 the four hundred billion stars. That’s a lot of stars, roughly ten thousand for every grain of sand on earth. There are about twenty billion sunlike stars in the Milky Way, and estimates suggest that a fifth of them, have an earth sized planet in it’s habitable zone, the area with conditions that enable life to exist. If only zero point one percent of those planet harbor life, there would be one million planets with life in the milky way. But wait, there’s more. The Milky Way is about thirteen 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 planet was born. Earth is only four billions 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. What would such a civilization look like? There are three categories. A type one civilization would be able to access the whole energy available on its planet. In case you are wondering, we are currently around zero point seven three on the scale, and we should reach type one sometime in the next couple hundred years. Type two would be a civilization capable of harnessing all of the energy of its home star. 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 three is a civilization that basically controls it’s whole galaxy and its energy An alien race this advanced would probably be godlike 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 one-thousand years, we could colonize the whole galaxy in two 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, 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’ve passed them. Maybe it is way harder for complex life to develop then we think. The process, allowing life to begin, hasn’t yet been completely figured out, and the conditions required may be really complicated. Maybe in the past, the Universe was way more hostile, and only recently things have 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 then the beginning of human existence. Or, maybe there is an ancient type three 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 are alone. Right now, we have no evidence that there’s any life besides us. Nothing. The Universe appears to be empty and dead. No ones sending us messages, no one answering our calls. We may be completely alone, trapped on a tiny moist mud ball in an eternal Universe. Does that thought scare you? If it does, you are having the correct emotional reaction. If we let life on this planet die, perhaps there would be no life left in the Universe. Life would be gone, maybe forever. If this is the case, we just have to venture to the stars and become the first Type Three civilization, To keep the delicate flame of life existing, and to spread it until the universe breathes its final breath, and vanishes into oblivion. The universe is too beautiful not to be experienced by someone. This video was made possible by your 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 Patreon page.

Jean Kelley



  1. Kurzgesagt – In a Nutshell Posted on February 8, 2019 at 4:07 pm

    There's brand new stuff in the Kurzgesagt Merch Shop. Check it out here:

  2. Kendra Lloyd Posted on August 4, 2019 at 8:30 am

    Ok if there were species more advanced than us traveling the stars. Would they speak to us??? A better statement and follow up is…We are more advanced than every other species on our planet. Do we speak to them? No… but we do a lot of observing………mic drop

  3. Long Ps Posted on August 4, 2019 at 1:38 pm

    Seems like Kurzgesagt loves Doctor Who

  4. Cralo Posted on August 4, 2019 at 7:59 pm

    Let’s have a ship that can manipulate the gravity around it and we’ll just fall everywhere at the speed of light (I obviously don’t know what I’m talking about lol)

  5. Its-abit-Fishy Raver Posted on August 4, 2019 at 10:38 pm

    did i spot a Magnemite at the beginning..

  6. Frost AussieStingR Posted on August 5, 2019 at 5:20 am

    5:11–5:25 is my love life

  7. Enrique Hernandez Zamudio Posted on August 5, 2019 at 5:27 am

    What a beautiful video 👌

  8. Cheesy Chummies Posted on August 5, 2019 at 5:52 am

    Hypothetically what if different gods from religions are type 2 civilizations?

  9. dave Posted on August 5, 2019 at 10:30 am

    me: *sees title*

    also me: *whispers* area 51

  10. dave Posted on August 5, 2019 at 10:31 am


  11. Boris Posted on August 5, 2019 at 6:35 pm

    I think it is beter to destroy ourselfs in a nuclear war.

  12. Special Guest Star Posted on August 5, 2019 at 8:46 pm

    "Great filters exist and they are ahead of us"
    I think that's the case. Massive pollution, more and more nuclear weapons, climate change…at this rate, humanity has 150-200 years left at best, and the last few decades will be about mass extinction.

  13. Moe Posted on August 6, 2019 at 4:31 am


  14. Uttaran Ghosal Posted on August 6, 2019 at 9:31 am

    Aliens are there

  15. liron levy Posted on August 6, 2019 at 10:18 am

    this is the job of Area 51 and the government not to tell us about aliens. Of course there is. And here another reason to invade area 51. That is the best idea humanity ever had 🤣

  16. Rage Bot Posted on August 6, 2019 at 4:29 pm

    We can just wait for Andromeda to collide with our mikly way and 'fingers crossed' there will be a earth like planet next to our solar system

  17. chicken king 69 Posted on August 6, 2019 at 10:24 pm


  18. Brabus 76 Posted on August 7, 2019 at 5:19 am

    Trump is the Alien

  19. Nyaluogo Walter Posted on August 7, 2019 at 11:52 am

    I love this video!!

  20. Lanceminecraftz plazutub Posted on August 7, 2019 at 1:27 pm

    6:05 oh no… thats bringing me bad memories 🙁

  21. Marlea Misoche Posted on August 7, 2019 at 3:09 pm

    God is an alien..

  22. Sampath Kumar Posted on August 7, 2019 at 6:05 pm

    What if there is some invisible force which prevents traveling objects from one Galaxy to other, maybe something separating galaxies from passing objects who knows no one did travelled just some maths,physics and assumptions no reality

  23. سعد الدوسري Posted on August 7, 2019 at 8:15 pm

    Why we here

  24. Realpatryk Posted on August 7, 2019 at 11:46 pm

    Answer: Area 51

  25. POLAR LIGHTS Posted on August 8, 2019 at 7:28 am

    Where alive because Pink diamond defended earth while the other galaxies got destroyed by Blue,Yellow and White

  26. J Pennington Posted on August 8, 2019 at 9:57 am

    Where are All the aliens???

    In our imaginations.

    Sad but TRUE


  27. Linus Ploner Posted on August 8, 2019 at 12:57 pm

    Yo 0:26 is this a fucking magneto

  28. amazing_annacat Posted on August 8, 2019 at 1:09 pm

    0:20 is that an OG zora and magnemite

  29. Nestars2105 138433 Posted on August 8, 2019 at 1:19 pm

    Scientists found single cell
    Organisms on a habitual planet wait for them to evolve

  30. Jose Garza Posted on August 8, 2019 at 7:17 pm


  31. Shogun Posted on August 9, 2019 at 8:14 am

    I've never been a fan of the Fermi Paradox, it's an incredibly arrogant way to think about the universe. Humans are not special, there's almost certainly other life out there. It could be we're one of the first civilizations to rise, so it may be civs after us that look at OUR grandiose ruins on distant planets.

  32. kcgangsta 3116 Posted on August 9, 2019 at 9:04 am

    Am I hearing halo?

  33. Gab Gamer649 Posted on August 9, 2019 at 11:08 am

    The universe is infinite (at least growing infinite) so its like saying theres no 10372 or 19373 in pi to say no other life in the universe

  34. Lol Gay Posted on August 9, 2019 at 2:57 pm

    Mass effect 4:50

  35. catlancemc Yt Posted on August 9, 2019 at 5:59 pm

    Kirby will save us when everyone dies

  36. Kelt Meneer Posted on August 9, 2019 at 7:45 pm

    Global warming is gonna kill us so I don't mind the great filter.

  37. Ellis Parsons Posted on August 9, 2019 at 11:54 pm

    1:02 i enjoy that knights of sidonia reference quite a bit

  38. Anish Neupane Posted on August 10, 2019 at 3:46 am

    200hours seems a lot to make a single video. But abt 2millions years to colonize?

  39. Dyangelo Grullon Posted on August 10, 2019 at 4:05 am

    I just want to clap some alien cheeks.

  40. 1000 subs no videos Posted on August 10, 2019 at 6:39 am

    They are all in area 51.

    And we are all gonna meet them on semptember 2019

  41. General Caos Posted on August 10, 2019 at 7:12 am

    You forgot the 4th, 5th levels of civilizations.

    Edit: meant to say 4 and 5

  42. Vamsi Mohana Posted on August 10, 2019 at 3:10 pm

    This video: there may or may not be aliens but we'll never know
    Me: September 20th you'll see

  43. Michael Feyrnand Posted on August 10, 2019 at 4:48 pm

    Are you assuming they are not already here, and have been for thousands of years? What is alien? Would that include ancient peoples, highly advanced who are indigenous to this planet? There is plenty of proof that multiple extremely expensive black projects, that we pay for by default, have put us out in the galaxy already.

  44. Emmanuel Alexander Posted on August 10, 2019 at 6:56 pm

    Ppl read a book… The bible for starters

  45. Double Dudes Gaming Posted on August 10, 2019 at 10:19 pm

    0:18 who else noticed that the computer kind of looks like the computer from don’t hug me I’m scared 😂

  46. Matus Borgula Posted on August 11, 2019 at 1:16 pm

    400.000.000.000 stars in MW, 10.000 stars per grain of sand on earth= 40.000.000 grains. That's 1 grain of sand per 188 people. I will enjoy the beach much more now… 😂 😂 😂

  47. fireblaze Posted on August 11, 2019 at 1:32 pm

    0:29 magnemite

  48. PJ Pelgone Posted on August 11, 2019 at 2:05 pm

    Why is there a pokemon magnemite in 0:27

  49. Arya Desai Posted on August 11, 2019 at 2:16 pm

    I mean dinosaurs were around for millions of years, but they didn’t have any sort of scientific development because they just weren’t genetically wired that way. So ok other planets maybe species like the dinosaurs were never wiped out and just kept on persisting and intelligent life never developed.

  50. IMSCARED Posted on August 11, 2019 at 2:48 pm

    the aliens have a defrent evolution soo they will have nothing similar to what we thought like maybe an alien kind is made of pure energy for exemple

  51. Cassie Hakes Posted on August 11, 2019 at 3:30 pm

    i saw magnamite

  52. Raul Valencia Posted on August 11, 2019 at 3:35 pm

    Man this is the deepest video I've ever seen in my entire life. 😐😆🌎

  53. ITACHI Posted on August 11, 2019 at 4:34 pm

    Far away in space some aliens have developed a telescope and can see us living on Earth, but they don't yet have a technology to reach us

  54. BowlofIndoMee Posted on August 11, 2019 at 4:38 pm

    lol Galacduck

  55. Bastian Villebro Posted on August 11, 2019 at 4:59 pm


  56. jannes tiemes Posted on August 11, 2019 at 5:17 pm

    Maybe there's a galactic federation and we will get incorporated in it if and when we become advanced enough.

  57. Krypton Gaming Posted on August 11, 2019 at 5:47 pm

    0:29 did anyone noticed magnamite?

  58. Zachary Dunn Posted on August 11, 2019 at 5:57 pm

    Answer to the fermi paradox: God exists and only chose to create life once.

  59. Evoke Snow Posted on August 11, 2019 at 9:38 pm

    Why are scientists looking at planets in the Goldilocks zone even though aliens may not do well in them conditions and we are looking for carbon based life but it probably is something totally different but humans can’t imagine anything more than carbon based life as their brains aren’t complex enough

  60. joey beunis Posted on August 11, 2019 at 11:11 pm

    think about this… people want to get to another planet because the resourses on earth will be gone at some point. they have plans and ideas for it. but could it be the case that we already did that and maybe mars or another planet was our earth before this one.

  61. General Katyusha Posted on August 12, 2019 at 1:54 am

    Fun fact: Ailens will apear on Area 51.

  62. aidanbobhog Posted on August 12, 2019 at 3:25 am

    Dont you think if diseases could make YouTube videos for each other they would say the same thing about people's bodies? It's too beautiful let's colonize it until it DIES.

  63. Justin Snyder Posted on August 12, 2019 at 4:12 am

    Hopefully we are not alone out there .. Since man has looked up to the stars we have dreamed of banging an alien species .

  64. Noah chip Posted on August 12, 2019 at 5:10 am

    maybe they died before us

  65. Henry Marckisotto Posted on August 12, 2019 at 6:16 am

    Don't you hate when things explode a lot?

  66. احمد- ساما Posted on August 12, 2019 at 6:28 am

    Maybe they life in a cold or a hot plant

  67. Adam Garcia Posted on August 12, 2019 at 6:32 am

    Either we are alone in the universe or we aren't. Both are equally as terrifying.

  68. Adam Gerard Posted on August 12, 2019 at 6:53 am

    Another answer: our understanding of physical reality is so misguided or inaccurate in some way, that our inferences about any advanced species are almost entirely incorrect. They would go to another physical realm, a philosopher's possible world (which is a physicist's universe), etc. When our incumbent science says 90+% of energy and matter is almost completely unbeknownst to us, that's the hypothesis I'd be likely to hold 🙂

  69. Megatron Posted on August 12, 2019 at 7:29 am

    Is there any single aliens out there lol all desperate🤣

  70. Stas's here Posted on August 12, 2019 at 8:34 am

    Am i the only one that sees magnimite at 0:27 in the middle

  71. Aishwarya Mudgal Posted on August 12, 2019 at 9:10 am

    Have you ever thought what would our galaxies name be kept by some other aliens?!
    .fjfjffj23235 or
    .hilly way or would it be in emoji s like
    .🙆😙😘🙋😽🙊🙊 or
    . Some totally different language! 😀


  72. Lukeland Posted on August 12, 2019 at 9:14 am

    Maybe We Are Just An Endangered Species That Is Being Protected By A Type III Civilization From Bastard Aliens Who Are Trying To Destroy Us All

  73. HSN Posted on August 12, 2019 at 12:28 pm

    So were are first advanced creatures in universe!
    what is the problem? Deal with it, it's a good thing

  74. biju nair Posted on August 12, 2019 at 12:56 pm

    Shut up and go read sitchin…

  75. Nikedylan 2 Posted on August 12, 2019 at 5:31 pm

    O:25 magnemite

  76. Ali Shaikh Posted on August 12, 2019 at 6:18 pm

    Quite contrary to shephen hawkins

  77. joseph fernando Posted on August 12, 2019 at 7:48 pm

    Gotta love the Knights of sidonia references at 1:07

  78. Matthieu Posted on August 12, 2019 at 7:54 pm

    4:50 so the reaper are waiting

  79. Sweet baby Jesus Posted on August 12, 2019 at 8:45 pm

    0:58 I see that Knights of Sidonia Reference

  80. strykr360 Posted on August 12, 2019 at 10:22 pm

    low key magnemite and mew in this video WOOOOOOO BAIBII

  81. TheGamer Posted on August 12, 2019 at 11:06 pm

    0:29 that's a pokemon on the yellow planet lols

  82. Sea Pupper Posted on August 12, 2019 at 11:51 pm

    I think aliens could exist.
    But I think humans are the only creatures in the universe that have an IQ over 7

  83. orang orangan jancok Posted on August 13, 2019 at 3:06 am

    mars just didn't arrive

  84. Gurudatta Praharaj Posted on August 13, 2019 at 3:07 am


  85. REDgamer 8 Posted on August 13, 2019 at 3:46 am

    Nod symbol and magnemite is in this video

  86. MGTOWcockney Posted on August 13, 2019 at 3:48 am

    Maybe we are the aliens

  87. Eric Thorpe Posted on August 13, 2019 at 4:09 am

    What if life comes bsck like earth becomes stable again

  88. Herbalattraction3000 Posted on August 13, 2019 at 10:59 am

    There's alot of evidence – if you believe people like Bob Lazar and Steven Greer. We're already being observed.

  89. Rajbala Rathee Posted on August 13, 2019 at 12:41 pm


  90. Blxde Beats Posted on August 13, 2019 at 2:09 pm

    They’re all in area 51

  91. C. I. A Posted on August 13, 2019 at 2:35 pm

    Earth: gets added to the grand Republic of the universe
    Every other alien race on the council: ughhhh who added these psychopaths

  92. kacknoobdeluxe Posted on August 13, 2019 at 3:57 pm

    4:15 Brotherhood of NOD

  93. Startion Posted on August 13, 2019 at 4:02 pm

    What if the reason why we aren’t seeing aliens is because they are all together watching us progress like a sitcom

  94. Roman Fedchenko Posted on August 13, 2019 at 4:11 pm

    Wait, if 400 billion stars is 10 thousand times for each grain then we have only 10 million sand grains on the planet. Does not sound right to me

  95. Andrew Posted on August 13, 2019 at 4:27 pm

    Not sure why aliens would necessarily be smarter

  96. Hank Francois Animo Posted on August 13, 2019 at 4:58 pm

    0:28 magnemite

  97. Hank Francois Animo Posted on August 13, 2019 at 5:05 pm

    Pokemon and marvel references