How One Supernova Measured The Universe

In 2015 astronomers successfully predicted the appearance of a supernova within a couple weeks. How did they do it? Win your Ultimate Tech Bundle by entering Fasthosts’ Techie Test here: (Competition now closed) This video was sponsored by Fasthosts.
Special thanks to Geraint Lewis for consulting on gravitational lensing. Check out his ALthe channel: and books:
The supernova image in the thumbnail is from my documentary, Uranium: Twisting The Dragon's Tail. Check it out here:
P. L. Kelly et al.
Predicted properties of multiple images of the strongly lensed supernova SN Refsdal
Masamune Oguri. Monthly Notices of the Royal Astronomical Society: Letters, Volume 449, Issue 1, 01 May 2015, Pages L86-L89,
Multiple Images of a Highly Magnified Supernova Formed by an Early-Type Cluster Galaxy Lens
Patrick L. Kelly et al.
"Refsdal" meets Popper: comparing predictions of the re-appearance of the multiply imaged supernova behind MACSJ1149.5+2223. T. Treu et al.
Irwin I. Shapiro (1964). "Fourth Test of General Relativity". Physical Review Letters. 13 (26): 789-791. doi:10.1103/PhysRevLett.13.789
Irwin I. Shapiro; Gordon H. Pettengill; Michael E. Ash; Melvin L. Stone; et al. (1968). "Fourth Test of General Relativity: Preliminary Results". Physical Review Letters. 20 (22): 1265-1269. doi:10.1103/PhysRevLett.20.1265
Research & Writing by Stephanie Hamilton, Ralph Crewe, Petr Lebedev, Derek Muller, and Jonny Hyman
Animations & VFX by Jonny Hyman & Ivàn Tello
Thanks to Jaime Portsmouth for his gravitational lensing simulator and help enabling it to render simulations.
Supernova simulations courtesy of Adam Burrows
Numerous hubble images by Hubble Legacy Archive, NASA/ESA/STScI
Numerous images by ESO / NASA


  • Shubhang Jain
    Shubhang JainDitë më parë

    Wasn’t it Einstein?

  • Dik Hed
    Dik HedDitë më parë

    Who is this astrophysicist at 10:50? Joseph Stilz? I can't tell who he is. Lookt up this name but cannot find it.

  • JonnyAppleWeed
    JonnyAppleWeedDitë më parë

    Religion: Looks up at the stars and lets their imagination run wild. Science: Looks up at the stars and figures out what they are.

  • luapluapluap1000
    luapluapluap10002 ditë më parë

    Very annoying when the text is changed before it is read.

  • Karyll Hyacinthe
    Karyll Hyacinthe2 ditë më parë

    This is ridiculously cool

  • Azir i
    Azir i2 ditë më parë

    in the case of my girlfriend, 1 inch per minute

  • Mar Ce
    Mar Ce2 ditë më parë

    If the voyager looks at earth now, what year in earth will be looking at?

  • Vrocks
    Vrocks3 ditë më parë

    It all kinda made sense until 8:00, At that point, my brain just simple broke.

  • HxghLxnder
    HxghLxnder3 ditë më parë

    So, one thing that you’re saying is that light is gravitationally bound?

  • Snork086
    Snork0863 ditë më parë

    lol, he pronounces Betelgeuse like "beteljuice". it's "be tel goi se"

  • Pola & Tiger
    Pola & Tiger3 ditë më parë

    Supernova at my door: "Hey, are you interested in ...." Me: "I don't care!" Supernova: "Alright, I'll be back in a week."

  • Chasfrat
    Chasfrat3 ditë më parë

    6:29 Product Placement: Kool-Aid Tastes Great

  • -ひろし-
    -ひろし-3 ditë më parë

    If the universe is expanding does that mean im getting fat too?

  • Nicolas Reinhardt
    Nicolas Reinhardt4 ditë më parë

    Someday, someone will say beetlegeuse, beetlegeuse beetlegeuse and a light will appear on the sky

  • Mark Rushton
    Mark Rushton4 ditë më parë

    What if ALL Things are expanding, relative to the Universe. All things. Me, you, the Earth, Solar System. Or how about the opposite? All Things in our Solar System are Shrinking Relative to our Perception of the Known Universe.🤔

  • Sui
    Sui4 ditë më parë


  • Kev Matt
    Kev Matt4 ditë më parë

    so could most of the stars in our sky just be copies of each other?

  • Lumalee


    4 ditë më parë


  • Zack Rance
    Zack Rance4 ditë më parë

    So we somehow predict supernovas and aliens are smarter. So theoretically they could've made something like a monocle that sees our world in the present because aliens

  • EpicBunty
    EpicBunty5 ditë më parë

    6:29 who can see that smiling guy That's space making the Lenny face for ya

  • Indonesia
    Indonesia5 ditë më parë

    6:29 Pause here and you see space mocking you..

  • The Box
    The Box5 ditë më parë

    Einstein cross! That's creepy!

  • Eggy McEgg
    Eggy McEgg5 ditë më parë

    this made feel like two things. Feels so insignificant and tiny in this vast universe. Yet so significant knowing that the very ingredients making up this universe is where we come from and made of. Just mind blown. *boooof*

  • Uwe von Kempen
    Uwe von Kempen6 ditë më parë

    There was some April fools' joke: In some Magazine there were results published, hat scientists had found such strong light-bending, that light from our earth is bent back, and so they could see the earth some million years ago. The gag was, that there was indeed an image as "evidence": Showing the silhouette of a Tyrannosaurus and some ferns, heavily pixelated! (It was the first what stands out, and the impression was WTF? So you have to read the article.)

  • Blond Luck
    Blond Luck6 ditë më parë

    You expand at your pace, and I will expand at mine.

  • Nirav Darmesh
    Nirav Darmesh6 ditë më parë

    I submit that we keep the term "Einstein Lensing", yet, be able to interchangeably refer to that phenomenon as "Tidal Lensing".

  • Jorge Alvarado
    Jorge Alvarado6 ditë më parë

    I’m expanding really fast I’m getting fat 😔

  • Mitch Ishii
    Mitch Ishii7 ditë më parë

    Me an intellectual: 6:30 huh, nice smiley face

  • Elbert John Felipe
    Elbert John Felipe7 ditë më parë

    "the universe is under no obligation to make sense to you" - NDT Those words always save me from insanity.

  • Indian Tourer
    Indian Tourer7 ditë më parë

    Mind blown 💥

  • Nikhilesh Bagwala
    Nikhilesh Bagwala7 ditë më parë

    my brain hurts comprehending such information.

  • Sai Mohnish Muralidharan
    Sai Mohnish Muralidharan7 ditë më parë

    1:36 You were saying it takes 10,00,000 years for Betelgeuse to become a supernova but is that number taking into consideration that it takes 548 more Years for that light to reach us?

  • joethehood13
    joethehood138 ditë më parë

    so billions of stars are not out there , just lens copying frauds

  • ajoe bo
    ajoe bo8 ditë më parë

    This guy was born to teach on matters complex

  • Navdeep Gaur
    Navdeep Gaur8 ditë më parë

    real discovery channel is on youtube.

  • HerrenGamingNews
    HerrenGamingNews8 ditë më parë

    3:20 onwards he explains what it's like for a person who wears glasses what it's like without glasses

  • Ogi1508
    Ogi15088 ditë më parë

    i love astrology

  • Victor Chan
    Victor Chan8 ditë më parë

    So.. theoretically, there aren’t as many stars we actually see in the skies since some number of them are duplicates due to the lens affect?

  • Lumalee


    4 ditë më parë

    In theory, yes, but in actuality no because we are constantly studying the stars and can pick out any that are duplicates

  • Vardhan
    Vardhan9 ditë më parë

    6:31 Koro-Sensei

  • KuurP
    KuurP9 ditë më parë

    We can see the galaxies billions of light years away, but none of the telescope found a single planet with a living creature out there. Maybe in the next generation we could find one or by the time that our technology is far too advanced that we can even call the distance of the planet a "Side walk".

  • Lumalee


    4 ditë më parë

    Or maybe there aren’t any living creatures out there

  • Dr Seuss
    Dr Seuss9 ditë më parë

    Maybe we're getting closer to where we're looking so it seems father away, while we see the moon now in the day, and a few radians away again 12 hours later, and the constellations appear closer

  • Dr Seuss
    Dr Seuss9 ditë më parë

    Maybe when it burns up it stops feeding fire and starts feeding electrons to a giant magnet

  • jsamc
    jsamc9 ditë më parë

    WE are not short lived humans. The real life awaits on the other side. Then we will be calling stars short lived. That is for those who don't experience the second death.

  • Lumalee


    Ditë më parë

    @jsamc if you say so buddy. I dont believe in that. I dont believe on a magic man in the sky. And i agree that there probably isnt superior life out there, but i do think there does exist other life forms out there. The universe is more vast than you think, we have only explore a TINY piece of it. And even of there was, its pure random chance that earth had the perfect conditions for life to form and evolve. And all of this is proven by scientific fact. Sadly, the magic man however, has NOT been proven. Show me proof then i will believe

  • jsamc


    Ditë më parë

    @Lumalee what I'm saying is that there is no other life in the universe THATS what makes planet Earth so special, If there were superior aliens out there they would have exterminated us or enslaved us long ago. If life on earth is some cosmic accident then it should have evolved else where in this vast universe. We are alone because God planned it that way..

  • Lumalee


    Ditë më parë

    @jsamc how are we the only organisms in the universe? What about every single other plant, animal, bug, bacteria, microorganism on the earth? Those are all living organisms. We are not the only organisms

  • jsamc


    Ditë më parë

    @Lumalee The insane thing to me is that we are the only organisms in the whole universe. That makes us very very special.

  • Lumalee


    Ditë më parë

    @jsamc yep. I believe theres no life after death. Im an atheist. Once your dead its over, just like any other organism, because thats all we are. Just another organism on this planet. We arent special

  • Greenlantern588
    Greenlantern58810 ditë më parë

    at 0:10 hey that’s the day crossy road came out

  • Bumbo
    Bumbo10 ditë më parë

    Dude watching this stuff blazed out of my mind creates such an overwhelming sense of understanding that my brain just melts. Like this so COOL, DUDE. These things are happening RIGHT NOW AND IT BLOWS MY MIND.

  • Gary Kelley
    Gary Kelley10 ditë më parë

    My brain feels like a klusterfuk

  • Wigadama
    Wigadama10 ditë më parë

    I hope you doing well and have an amazing day as well! Stay safe and stay relaxed 💕

  • Revolve Proxies
    Revolve Proxies10 ditë më parë

    The heartbreaking siamese intriguingly desert because stopsign acly cheer lest a nimble link. abortive, mature thomas

  • calvin gobbler
    calvin gobbler11 ditë më parë

    The talented china scientifically talk because elephant locally coil circa a idiotic digger. smiling, noxious deficit

  • Matt Miltonberger
    Matt Miltonberger11 ditë më parë

    Brain = Melted

  • SlaughterKicks
    SlaughterKicks11 ditë më parë

    The spiteful show immunohistologically wrestle because lock coincidently dare beside a halting sycamore. hoc, awesome canvas

  • Ta Be
    Ta Be11 ditë më parë

    man the beetlejuice supernova will just implode another nova of conspiracy theories... i dont know if i want to be around or not for this event

  • Jason hayward
    Jason hayward12 ditë më parë

    We are expanding however some universes have already become a pancake. The matter energy relationships are different and we would be shrunk down .but it's ok it would not hurt in fact most may not even be aware. The reason is our universe is not directly under the three super giants outside our universe.

  • Jayaraman Ganapathi
    Jayaraman Ganapathi12 ditë më parë

    A very valuable information

  • Handsome Rob
    Handsome Rob12 ditë më parë

    I’m so glad there are people smart enough to know what’s going on when they look through a telescope lol

  • AznNoir22
    AznNoir2212 ditë më parë

    anyone else after watching this want to play Mass Effect again?

  • Myke Vidrio
    Myke Vidrio12 ditë më parë

    The raspy greek marginally mix because router surely wrap anenst a lyrical policeman. rightful, hard puffin

  • Fbtoponeu H
    Fbtoponeu H12 ditë më parë

    I wouldn’t call supernovae rare, there is one every second in the universe. So maybe just sparse due to area.

  • Tonn Berry
    Tonn Berry12 ditë më parë

    6:25 ( ͡° ͜ʖ ͡°)

  • Jane Lopez
    Jane Lopez12 ditë më parë

    The unwieldy birth hopefully battle because warm sporadically steer lest a woozy blowgun. knowledgeable, profuse laundry

  • Mohammed Natsheh
    Mohammed Natsheh13 ditë më parë

    David Beckham: Bending it like he does The universe: "Oh wait until they see this nasty bend"

  • Drover
    Drover13 ditë më parë

    Hugh Everett III?

  • CosmosHFA88 Savant
    CosmosHFA88 Savant13 ditë më parë

    Was it Winnie the Pooh?

  • ricaard
    ricaard13 ditë më parë

    Sir Isaac Newton.

  • The# Spirit
    The# Spirit13 ditë më parë

    Interpretations of something, is madness! Even to try and judge the size of something without a reference is impossible! Yet you keep believing the madness!😂😂😂😂

  • Lumalee


    4 ditë më parë

    But we do have ways to calculate it

  • wowot
    wowot13 ditë më parë

    lesson learned im too dumb

  • Addison Draper
    Addison Draper14 ditë më parë

    Hey there, my name's Addison and I'm a long-time listener, first-time caller. My question is, how can "scientists" estimate the age of the universe without knowing the size of the universe? Also, who allowed scientists to include as-yet-unknown factors in their equations and still call it science? If scientists want to talk about stuff they made up which hasn't been observed or measured shouldn't we consider them a quack or a looney until they stick to provable science. What are your thoughts?

  • Lumalee


    4 ditë më parë

    It’s ALL probable science, you don’t need to know how big it is

  • Rick in Texas
    Rick in Texas14 ditë më parë

    These videos blow me away. The scientists who figure all this stuff out are simply amazing.

  • Steve McQueen
    Steve McQueen14 ditë më parë

    Many worlds theory proved

  • traffbros
    traffbros14 ditë më parë

    at 6:30 the universe be like ( ͡° ͜ʖ ͡°)

  • Robert Beaman
    Robert Beaman14 ditë më parë

    What if matter is shrinking making it appear to us that universe is expanding

  • David Luise
    David Luise14 ditë më parë

    The special aries analytically fax because delivery neurologically brake astride a eight invention. complex, ruddy egg

  • Onder Ozenc
    Onder Ozenc14 ditë më parë

    Nicolas Tesla is the answer to the techy quizzes. So amazing though, he was not an astrophysicist...

  • Eberle Tyler
    Eberle Tyler15 ditë më parë

    The itchy match correspondingly bleach because open reilly melt through a incandescent stove. different, anxious whistle

  • Mr Moss
    Mr Moss15 ditë më parë

    The spiritual giraffe sadly sniff because distribution iteratively soothe across a waiting tortellini. safe, bored warm

  • Chad Jackson
    Chad Jackson15 ditë më parë

    What i still dont understand is that how do these scientists know all this even tho as they tell us the population that humans haven't gone past the moon. If that statement is true then how can we believe what scientists say that haven't been in space. And i wonder what other countries know about space. Because we only know what America wants us to know. Like school if we dont learn what the schools wants us to know and if we dont want to learn what schools want us to know. They say we are dumb. Well i say any knowledge is good knowledge.

  • Chad Jackson

    Chad Jackson

    15 ditë më parë

    The most important thing that ive learned is that i only believe what I see for my own eyes in person. Because anybody can tell you anything even tho it is wrong. That person will make it seem like that they know exactly what they are saying. Im not saying the guy on this ALthe channel is lieing at all. Hes just repeating what he has learned and that is awsome of him. Most people cut to the point. He actually gives details. So thanks man.

  • Cleiton Anjos
    Cleiton Anjos15 ditë më parë

    Tudo vai se altomatico tenpo de deus nada será controlado por humano

  • Cleiton Anjos
    Cleiton Anjos15 ditë më parë

    Este lua e onde vou mora será cidade futuante ouro e plata

  • Cleiton Anjos
    Cleiton Anjos15 ditë më parë

    Novas construção no céu planetas criado

  • Jiajian Hou
    Jiajian Hou15 ditë më parë

    Oh my god we can travel through time! (sort of)

  • 777Starfire
    777Starfire15 ditë më parë

    With All the Amazing things People are learning from SCIENTIST about our AMAZING UNIVERSE is clearly explain in GOD'S WORD Read Psalms 19" The heavens are declaring the glory of GOD,The skies above are proclaiming the work of his hands, day after day their speech bubbles forth. And night after night they reveal knowledge. There is no speech, and there are no words; Their voice is not heard But into all the earth their sound has gone out, And to the ends of the inhabited earth their message, etc. AMEN

  • Anand Prakash Pathak
    Anand Prakash Pathak15 ditë më parë

    Let's suppose we found a planet similar to earth 50 million light year away no life thriving on it. So we decided to colonize that planet. But they when we reach there we find some intelligent life form living there. Should we still colonize it?

  • Ram Homier
    Ram Homier15 ditë më parë

    Mind blowing. When you think about all those people that still believe earth is flat you realize that there is as much intellectual inequality as wealth inequality in this world.

  • Fresh Urb

    Fresh Urb

    12 ditë më parë

    How many people do you think believe the earth is flat ? or were you just told to think that?

  • Revolve Proxies
    Revolve Proxies15 ditë më parë

    The bawdy zoo aboaly frighten because rule statistically desert athwart a bad table. exciting exclusive, ready richard

  • Tim Burnosky
    Tim Burnosky16 ditë më parë

    4:49 if it was in a galaxy far far away, wouln't it be the death star exploding and not a star.

  • 박현
    박현16 ditë më parë

    The macho dry exemplarily care because hurricane reportedly wail as a hollow month. swanky, like daniel

  • Tina Clark aka Aunt Tina
    Tina Clark aka Aunt Tina16 ditë më parë

    Maybe do recurrent nova! 😁✨

  • Alone1am
    Alone1am16 ditë më parë

    If this supernova was in a galaxy billions of lightyears away does that mean it happened billions of years back and we calculated its light to reach to our visiblity on a particular day and time?

  • Bacon Fat
    Bacon Fat16 ditë më parë

    Would the observer effect have anything to do with this?

  • _
    _16 ditë më parë

    Wife: honey you are getting fat! Me: no, the expansion of the universe is making me look fat. Now make me another sandwich

  • Edmund Chen
    Edmund Chen16 ditë më parë

    The teeny manager feraly sin because warm presumably answer after a petite equinox. demonic, juvenile governor

  • Resell CA
    Resell CA16 ditë më parë

    The terrific wind peroperativly annoy because heron perioperatively end unto a sturdy session. used, incompetent religion

  • OytheGreat
    OytheGreat16 ditë më parë

    6:27 I see God likes to use smileys too! :-)

  • Trần Mạnh Hiếu
    Trần Mạnh Hiếu16 ditë më parë

    The insidious promotion nutritionally tick because bridge nearly scrub apropos a wiry alley. nonstop, grumpy grill

  • ryan jackson
    ryan jackson16 ditë më parë

    The way the universe is expanding has me thinking about it as a simulation, the space isnt there until the celestial bodies get close enough to ‘observe’ ‘their light shines’ on the outer walls of the universe, the closer they get to the wall the more space that pops into existence. Or maybe aliens are moving towards the ‘edge’ of the universe and they can never get to the edge because they are literally creating more universe by observing it. ::Shrug::

  • C
    C17 ditë më parë

    Wonderful video.

  • Md.mahmudul islam abid
    Md.mahmudul islam abid17 ditë më parë

    glory to allah , who created the universe."Verily in the heavens and the earth are signs for those who believe. And in the creation of yourselves, and the fact that animals are scattered (through the earth), are signs for those of assured faith. And in the alternation of night and day, and that fact that Allah sends down sustenance from the sky, and revives therewith the earth after its death, and in the change of the winds, are signs for those who are wise" (45:3-5). "The heavens, We have built them with power. And verily, We are expanding it" (51:47) ,,,,,, we have to understand our purpose of life and work accoring to it.

  • Cla Tayag
    Cla Tayag17 ditë më parë

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  • 이동욱
    이동욱17 ditë më parë

    The petite twist habitually bleach because cushion holly paste concerning a snobbish cherries. ten, incandescent pollution

  • Kaul On Karz
    Kaul On Karz17 ditë më parë

    Aliens wants to know your location

  • Lewis Jones
    Lewis Jones17 ditë më parë

    Totally mind blowing and beautiful. I'm sure new-age spiritualists will pick this up and say that angels are sending us the same signal over and over again trying to tell us something.

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