Where are all the aliens? | Stephen Webb

  • Published: 16 August 2018
  • The universe is incredibly old, astoundingly vast and populated by trillions of planets -- so where are all the aliens? Astronomer Stephen Webb has an explanation: we're alone in the universe. In a mind-expanding talk, he spells out the remarkable barriers a planet would need to clear in order to host an extraterrestrial civilization -- and makes a case for the beauty of our potential cosmic loneliness. "The silence of the universe is shouting, 'We're the creatures who got lucky,'" Webb says.

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  • Science and Technology Science and Technology

Comments • 9 383

  • anti Kecurangan
    anti Kecurangan  3 hours back

    Allien is presenting in front of the audience

    • High_visions
      High_visions  8 hours back


      Me: looks up aliens on YouTube @ 4am

      • Chris
        Chris  10 hours back

        Jason stathams nerdy brother

        • Dee B
          Dee B  13 hours back


          • Richard Miranda
            Richard Miranda  13 hours back

            jason statham got me hooked yet again

            • goerge john
              goerge john  14 hours back

              the dude talked so much sense

              • Hassan M. Hassan
                Hassan M. Hassan  15 hours back

                Humans ARE the aliens... we're looking for signs of ourselves.

              • Rob Perez
                Rob Perez  21 hours back

                Frame Shift Drive Charging....

                • Bruce Kilgour
                  Bruce Kilgour  22 hours back

                  They have shape-shifted into beings on another dimension.

                  • MR. MARS MAGNIFIER of Martian Cultures

                    I submit hundreds of sharpened NASA Mars Curiosity Rover photographs that show we are not alone.

                    • John O' Keeffe
                      John O' Keeffe  1 days back

                      His laugh per minute ratio is off the scale

                      • murray webb
                        murray webb  1 days back

                        This dude is an 👽 👾

                        • Jason Dunn
                          Jason Dunn  2 days back

                          I kinda think this guy is wrong, he never even brought up other dimensions, or how bout the belief now that there may be even more galaxies inside of black holes...soooo yea ima to with i think its impossible to be alone!

                          • Jason Dunn
                            Jason Dunn  6 hours back

                            @Colin Coogan the title is where are all the aliens?

                          • Colin Coogan
                            Colin Coogan  9 hours back

                            Jason Dunn other dimensions would not be our universe

                        • Xnknown X
                          Xnknown X  2 days back

                          July 16, 2019.
                          August 1, 2019.

                          Universe: 13.8 billion years old.

                          The higher power could be creating far much greater than we could; especially since we wouldn't even begin to start until December 31, 2019 (12 minutes).

                          • Arctic Seraph
                            Arctic Seraph  2 days back

                            There are no aliens. They're genetically modified, time travelling humans.

                            • James McDaid
                              James McDaid  2 days back

                              I think people missed the point what this guy was trying to say.

                              He's not saying we're alone and that's the end of it. He's saying it's a possibility that we may be the only civilization in the universe or maybe even that we're the very first to pop up. If that's they case then it could be us that discovers and fertilises the rest of the universe.

                              • David Walmsley
                                David Walmsley  2 days back

                                He lost me near the beginning when he said that consciousness grew out of everything in science that preceded it. When the materialists get around to examining consciousness closely, they will discover that consciousness created everything and continues to do so.

                                • Colin Coogan
                                  Colin Coogan  9 hours back

                                  Nah cause is the observation of the natural world and observed process would continue rather or not we observed them, so yes consciousness would grow out of natural processes that can be observed by science

                              • Danny Infante
                                Danny Infante  2 days back


                                • Erik Lemay
                                  Erik Lemay  3 days back

                                  Your whole presentation is based on human observational capacities which are very very limited. Who are we to call our endeavour complex ? Who are we to call ourselves intelligent ? We have access to less than 1% of the electromagnetic spectrum, we have wars, religions, frontiers and customs. This is not an evolved behavior. If we searched for intelligence rather than life we would have better results. A civilisation that is very ancient would have surpassed the limitations of polarities, matters, space and time. Looking at this with human logic is like teaching math to ants. We are so immature it is scary.

                                  • Bryn Jones
                                    Bryn Jones  3 days back

                                    me and the boys watching this video to see if Area 51 is where the aliens are at

                                    • Cecil McKeithan
                                      Cecil McKeithan  3 days back

                                      I’ve said it before I’ll say it again if we are the only intelligent beings in all the galaxy’s what a waste of space.

                                      • Academia de Música Ávila

                                        If you close your eyes you can hear Jason Statham.

                                        • David Zewalk
                                          David Zewalk  3 days back

                                          There are only angels and demons, aliens don’t exist...

                                          • Zachary Jones
                                            Zachary Jones  20 hours back

                                            David Zewalk AHHHHHHHHHHHHHHHHHH U FOOL 🖕🖕🖕

                                        • Emma Kei
                                          Emma Kei  3 days back

                                          I saw a ship over Vedic City for 20 nights in a row when I was camping out. The ship contacted me telepathically, and gave me the same message every night. There was kind of a warm, rainbowy 80’s energy during the contact. I had been reading lots of books on Star People and molecular biology while starwatching nightly.

                                          • Warren Roth
                                            Warren Roth  4 days back

                                            Boy, sure is a lot of wasted space, if we're the only ones in it.

                                            • James McDaid
                                              James McDaid  2 days back

                                              There's my scientist.

                                            • charles g
                                              charles g  2 days back

                                              Warren Roth that’s where the space force comes in! Lol

                                          • Bawamode
                                            Bawamode  4 days back

                                            Lets Smash into area 51, You'll Get Yo Answer Hopefully xD

                                            • Daz Capone
                                              Daz Capone  1 days back

                                              Need to go to area S4 not area 51

                                            • Arctic Seraph
                                              Arctic Seraph  2 days back

                                              There's really nothing there. Just tin building full vitamin D deficient people playing dungeons and dragons, laughing at how they tricked the world into thinking they got aliens and spaceships there. In fact if these nerds were to step outside with their grey skin and bug eyes behind the coke bottle glasses, I'm sure any average person would mistaken them for a space alien.

                                          • charles g
                                            charles g  4 days back

                                            If aliens exist, they’d be able to tap into the internet and figure out how truly stupid the dominant species on the planet is, then they’d avoid us like a bad neighborhood.

                                            • Resurrected Cylon
                                              Resurrected Cylon  4 days back

                                              ETs could have visited Earth when it was populated by non-avian dinosaurs, pterosaurs, plesiosaurs, and tiny mammals scurrying around in the undergrowth, sent a message back to the mothership that there was no intelligent life, did some studies, took some samples, and left. 100 million years later, humans look up at the stars and wonder if there's life out there, develop ships to reach the first ever life sustaining alien planet, land on it and discover a world dominated by strange creatures, send a message back to the mothership that there's no sign of intelligent life, do some studies, take some samples, and leave. On that planet, 70 million years later, intelligent life forms look up at the stars and wonder if there's life out there....

                                              • Josh Ruble
                                                Josh Ruble  4 days back

                                                This guy sounds just like theramin trees

                                                • Raimund Scheucher
                                                  Raimund Scheucher  4 days back

                                                  The conclusion here fits well with mine: we are the creatures that settle Mars in this century and the galaxy during the coming thousand years. To leave our planet system we need new technology that will be developed until the end of this century on earth, mars or any of the human colonies that will be founded in our planet system.

                                                  • AAH Replies
                                                    AAH Replies  4 days back

                                                    Amusing this. The ego of those Stephen has questioned must be enormous. If aliens have found us and built spacecraft sophisticated enough to show themselves to us - what have we got to offer them?
                                                    We are destructive, and pretty stupid in the main [given where we are now we've engineered our own demise] . Only a handful of people have been creative enough to produce things of beauty, mostly we appear to destroy things of beauty, great beauty.
                                                    There is plenty of evidence going back to the time of Aristotle for UFOs, even evidence that a war between UFOs was conducted for our planet


                                                    I'm with Charles Fort on this one:

                                                    "I think that there are, out in inter-planetary space, Super Tamerlanes at the head of hosts of celestial ravagers--which have come here and pounced upon civilizations of the past, cleaning them up all but their bones, or temples and monuments--for which later historians have invented exclusionist histories. But if something now has a legal right to us, and can enforce its proprietorship, they've been warned off. It's the way of all exploitation. I should say that we're now under cultivation: that we're conscious of it, but have the impertinence to attribute it all to our own nobler and higher instincts……………..

                                                    But the acceptance is forced upon me that there are modes and modes and modes of inter-planetary existence: … a super-geography--or celestiography--of vast stagnant regions, but also of Super-Niagaras and Ultra-Mississippis: and a super-sociology--voyagers and tourists and ravagers: the hunted and the hunting: the super-mercantile, the super-piratic, the super-evangelical………….

                                                    The universal attempt to formulate or to regularize - an attempt that can be made only by disregarding or denying. Or all things disregard or deny that which will eventually invade and destroy them .......

                                                    • Julie
                                                      Julie  4 days back

                                                      If it's not of God it's of the Adversary; Satan. With that being truth for followers of Ya'shua the Messiah; pursuing alien life could have the most negative effects. I don't need to search for evil.

                                                      Ephesians 6:12 ESV For we do not wrestle against flesh and blood, but against the rulers, against the authorities, against the cosmic powers over this present darkness, against the spiritual forces of evil in the heavenly places.
                                                      1 John 5:19 ESV/ We know that we are from God, and the whole world lies in the power of the evil one.

                                                      Since I'm quoting scripture, I'll include this one:
                                                      2 Corinthians 4:4 ESV/In their case the god of this world has blinded the minds of the unbelievers, to keep them from seeing the light of the gospel of the glory of Christ, who is the image of God. (This is why you don't understand). John 20:29 ESV/Jesus said to him, “Have you believed because you have seen me? Blessed are those who have not seen and yet have believed.” Isaiah 55:8 ESV/For my thoughts are not your thoughts, neither are your ways my ways, declares the Lord.

                                                      • john thewonderboy
                                                        john thewonderboy  4 days back

                                                        Phil Schneider listen to his story asap

                                                        • Piscator 2DeePIn ThIrtYODDsIxeR

                                                          Beem me up scotty this planet sucks!!

                                                          • Avishkar Wadiyar
                                                            Avishkar Wadiyar  4 days back

                                                            Dumbest thing is to try to find alien. Just try to figure out life.

                                                            • Daher Hani
                                                              Daher Hani  4 days back

                                                              this sucks. we are alone. damn it

                                                              • Bobby Tee
                                                                Bobby Tee  4 days back

                                                                But no problem believing in the invisible man in the sky......

                                                              • Joel Moore
                                                                Joel Moore  4 days back

                                                                Area 51 raid will help.

                                                                • Rudy Cooper
                                                                  Rudy Cooper  3 days back

                                                                  I don't get it why millions of Americans just don't gather there and raid it?

                                                              • Alex Carreon
                                                                Alex Carreon  4 days back

                                                                I have come to the precise conclusion detailed in this video. We are alone because the plethora of factors that grant our existence, and the logic of probability inevitably points to an infinite impossibility of our existance, whether by happenstance or design; therefore, we are truly lucky. Now, the dilemma of interstellar colonization. ...and we meet the impenetrable wall of radiation. But I digress.

                                                                • SAVAGE 316
                                                                  SAVAGE 316  4 days back

                                                                  AREA 51

                                                                  • Hollowwsstory
                                                                    Hollowwsstory  4 days back

                                                                    Life is everywhere in the universe, just not everywhere in the observable universe.
                                                                    I think we might be vastly under estimating the true size of the universe. Life seems rare, but it must happen. Non mystical physical rules and time have created us and must do so elsewhere in the universe. Life probably begins and ends on thousands of planets every second. And yet we see none of them. The universe is bigger than we can imagine.

                                                                  • dylan storm trooper der

                                                                    on Uranus :)-

                                                                    • RH celtic
                                                                      RH celtic  5 days back

                                                                      British propaganda ! dont believe your eyes...

                                                                      • Shital Singh
                                                                        Shital Singh  5 days back

                                                                        He is right, we are most probably alone or among few hundreds and not respecting the beautiful earth we got.... we are just overpopulating and overpolluting our earth for just our comfort... we are intelligent species.. shouldn't this earth be a better place then?

                                                                        • g
                                                                          g  5 days back

                                                                          "evolution does not have space travel as an end goal" he says...i would like to know :
                                                                          1 how does he know that
                                                                          2 then what IS the endgoal of evolution?
                                                                          he can not even stop his own thoughtflow at will for as little as an hour, probly not even 30 seconds, but makes bold statements about the meaning of life...
                                                                          another TED headless chicken

                                                                          • andrew handelsman
                                                                            andrew handelsman  2 days back

                                                                            Evolution is just change in allele frequencies over time, no reason to posit an end goal until there's evidence that suggests there is one. But hey, I'm glad to be shown I'm wrong

                                                                        • Chad Kniphfer
                                                                          Chad Kniphfer  5 days back

                                                                          You should read the bible

                                                                          • SillySocks
                                                                            SillySocks  5 days back

                                                                            lets say the universe its 13 billion years old and life would theoretically be possible in the summer. lets say we just appeared after about 6 billion years of it being possible for life to emerge. now lets assume the universe has not been waiting 6 billion years, because on earth in 0,5 billion years there have been 3 different life events, excluding single cell. if we assume every 0,5 billion years a planet that passed the universe barriers can produce a single life event, earth had 3, then every planet ready for life has had possibly 12 chances to produce a single life event, a possibility for complex life. and since there are billions of planets in the habitable zones of our galaxy alone, i conclude this is a theory that considers only the factors that proves it self, and leaves out others that might disprove it. Imo its not that we are alone, there are a lot of civilization out there, i think we are just overestimating and imagining to much when it comes to interstellar travel. i think we imagine and theorize ways of going faster than light but in reality there might be civilizations millions of year old that have long found it to be impossible to do. so imo its more likely we have a lot of neighbours in our galaxy, we just cant reach each other. the milky of 100k light years apart, and if there are 100 civilizations, all separated by 1000 light years, we might never run into each other. we might need 950 more years for our signals to be picked up by someone else, and 1000 years after that for them to respond... so yeah, no one knows the answer to this one im afraid :P

                                                                            • ilmaestro305 Hoch
                                                                              ilmaestro305 Hoch  5 days back

                                                                              Could this what are ancestors called Divine Providence?