These are the asteroids to worry about

30 Nov 2020
6 758 681 Aufrufe

Stephen Hawking thought an asteroid impact posed the greatest threat to life on Earth. Thanks to Kiwico for sponsoring this video. For 50% off your first month of any crate, go to
For other potential world ending catastrophes, check out Domain of Science:
Special thanks to:
Prof. Dave Jewitt from UCLA Earth, Planetary, and Space Sciences
Prof. Mark Boslough from Sandia National Labs
Scott Manley:
Ryan Wyatt at Morrison Planetarium
Prof. Amy Mainzer
Alexandr Ivanov for the opening shot of Chelyabinsk Meteor
Maps of Asteroid Impacts
Time passing animation from Universe Sandbox -
Opposition Effect -
Belskaya, I. N., & Shevchenko, V. G. (2000). Opposition effect of asteroids. Icarus, 147(1), 94-105.
Potentially Hazardous Asteroids -
Perna, D., Barucci, M. A., & Fulchignoni, M. (2013). The near-Earth objects and their potential threat to our planet. The Astronomy and Astrophysics Review, 21(1), 65.
Survey of Potentially Hazardous Asteroids -
Population Vulnerability -
Rumpf, C. M., Lewis, H. G., & Atkinson, P. M. (2017). Population vulnerability models for asteroid impact risk assessment. Meteoritics & Planetary Science, 52(6), 1082-1102.
Size distribution of NEOs -
Trilling, D. E., Valdes, F., Allen, L., James, D., Fuentes, C., Herrera, D., ... & Rajagopal, J. (2017). The size distribution of near-earth objects larger than 10 m. The Astronomical Journal, 154(4), 170.
2020 NEOWISE Data Release -
National Research Council Report-
Board, S. S., & National Research Council. (2010). Defending planet earth: Near-Earth-Object surveys and hazard mitigation strategies. National Academies Press.
Tug Boat -
Schweickart, R. L., Lu, E. T., Hut, P., & Chapman, C. R. (2003). The asteroid tugboat. Scientific American, 289(5), 54-61.
Gravity Tractor 1 -
Lu, E. T., & Love, S. G. (2005). Gravitational tractor for towing asteroids. Nature, 438(7065), 177-178.
Laser Ablation -
Thiry, N., & Vasile, M. (2014). Recent advances in laser ablation modelling for asteroid deflection methods. SPIE Optical Engineering+ Applications, 922608-922608.
Yarakovsky Effect -
DART Mission -
Nuclear 1 -
Ahrens, T. J., & Harris, A. W. (1992). Deflection and fragmentation of near-Earth asteroids. Nature, 360(6403), 429-433.
Nuclear 2 -
Bradley, P. A., Plesko, C. S., Clement, R. R., Conlon, L. M., Weaver, R. P., Guzik, J. A., ... & Huebner, W. F. (2010, January). Challenges of deflecting an asteroid or comet nucleus with a nuclear burst. In AIP Conference Proceedings (Vol. 1208, No. 1, pp. 430-437). American Institute of Physics.
Researched and Written by Petr Lebedev, Jonny Hyman and Derek Muller
3D animations, VFX, SFX, Audio Mixing by Jonny Hyman
2D animation by Ivàn Tello
Intro animation by Nicolas Pratt
With Filming by Raquel Nuno
Music from "Stellar Dance" "Orbit" "That Notebook" "What We Discovered" "Out of Poppies" "Handwriting"
Images and video supplied by Getty Images

  • I'm interested in that T-Rex head! Where can I get one! ^..^~~

    recklesswhisperrecklesswhisperVor 26 Minuten
  • am scared now

    Philipp MullerPhilipp MullerVor Stunde
  • cool

    SpaceIL12 NSpaceIL12 NVor 2 Stunden
  • 14:25 "and, this could happen tomorrow?" *[softly] don't...*

    NikoNikoVor 5 Stunden
  • Nuking an asteroid should not be disregarded. I believe it's the most viable approach and doing in near proximity to Earth's atmosphere would prevent the chunks from clumping back together, allowing a greater surface area of Earth's atmosphere to burn the chunks.

    Anton SAnton SVor 6 Stunden
  • I feel sad when thinking about how dinosaurs would have felt back then...

    MrBeast ׂMrBeast ׂVor 6 Stunden
  • Way more intense than my pocket ace asteroid video. 😳

    The Greek GamblerThe Greek GamblerVor 7 Stunden
  • Chee leb enz

    the Vik vidsthe Vik vidsVor 8 Stunden
  • Wow

    the lava kid lava 2.0the lava kid lava 2.0Vor 9 Stunden
  • 😭😭😭😭😭🌏🌒☄️

    Eril CruzEril CruzVor 10 Stunden
  • So, basically this video and others like it, are fear mongering.. right? Maybe we all need to just dig a hole, and hide. Shut down our cars, our manufacturing, quit our jobs cause that causes all sorts of stiff and just HIDE.. right?

    enterprise59enterprise59Vor 10 Stunden
  • Well the aphopis in 2013 didn't really hit anything

    Miekayla jealayne ValenzuelaMiekayla jealayne ValenzuelaVor 11 Stunden
  • Why worry about things you can’t control

    PollutedMINDSPollutedMINDSVor 11 Stunden
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    Even LuisEven LuisVor 12 Stunden

    Zoomie the Gaming AIZoomie the Gaming AIVor 12 Stunden
  • The synonymous knickers largely grip because magic algorithmically bubble in a chief continent. scintillating, ill titanium

    darek klichdarek klichVor 16 Stunden
  • He's lucky that god didn't get any ideas

    Owen MarshallOwen MarshallVor 16 Stunden
  • I would simply intervene

    LucidTripLucidTripVor 17 Stunden
  • Hopefully an undercover bomb to land on CHINA!

    Sissy BSissy BVor 17 Stunden
  • The ONLY thing I can say is... Sometimes, it IS aliens. Closer and closer to disclosure, CIA put out like 5600 redacted docs

    TruthSeeker94 112TruthSeeker94 112Vor 19 Stunden
  • so they missed the one over Russia , funny that , aye !

    Thomas W.glasgowThomas W.glasgowVor Tag
  • Males me feel real, like we living on a rock hurtling through space.

    RobRobVor Tag
  • The main thing that scares me about this presentation is at the end where he describes Christmas as 'the holidays'. The end of the world might be a few years off but the end of common sense is already here.

    Acid DriveAcid DriveVor Tag
  • Comet's?

    Jake FordJake FordVor Tag
  • Stop thinking about bad things and worrying all your life lets enjoy our life until we really die

    AchievedHeavenAchievedHeavenVor Tag
  • Guys relax, y'all gonna forget this in two days.

    Buff SageBuff SageVor Tag
  • Where is Bruce Willis when you need him? Surely it striking the ocean is worse that striking the land?!

    basildon davebasildon daveVor Tag
  • Holland Taylor

    martalex sinmartalex sinVor Tag
  • Hello I love your video so much🔰🌻🍎🍍🌺🐹

    DIY Hamster WorldDIY Hamster WorldVor Tag
  • O man

    Gasper AntonyGasper AntonyVor Tag
  • just need to fire nuclear weapon on them cause nuclear weapons are invented to get rid of those not war

    UJJAL 018 B R E A C H E RUJJAL 018 B R E A C H E RVor Tag
  • An asteroid would probably hit the water though

    KurtSandfordKurtSandfordVor Tag
  • This documentary was so interesting. It’s so important to learn about astronomy. And so fascinating.

    SuperThunderGoodGuySuperThunderGoodGuyVor 2 Tage
  • Debbie Downer's Father

    SpaghettibenderSpaghettibenderVor 2 Tage
  • Last time I was watching or of this I woke up to formula drift so I’m down

    SABean RPuffSABean RPuffVor 2 Tage
  • here we go 2021 trailer

    simon morenosimon morenoVor 2 Tage
  • Thats why we need to take care the mother earth

  • Hahahahaha fake

    Abs SupremeAbs SupremeVor 2 Tage
    • Ya wannabe naruto profile I bet you are one of those flat earthers or just joking

      Owen MarshallOwen MarshallVor 16 Stunden
  • The material hammer univariately murder because offer ultimately rely aboard a actually drawbridge. loud, disgusting conga

    Bryan GoldfieldBryan GoldfieldVor 2 Tage
  • So we giving Jupiter a demerit for this one, or?

    のぢGreyのぢGreyVor 2 Tage
  • Fact: Duende/duwende in Filipino means "dwarf" in English

    Jay Vinson DahayJay Vinson DahayVor 2 Tage
  • mmmm remove the "a" from asteroids

    arcimedesarcimedesVor 2 Tage
  • The scariest thing is how big they are, the bigger asteroid, the bigger explosion it’s basically a nuke but way stronger (depending on the size)

    Death GamingDeath GamingVor 2 Tage
  • The last astroid hit 66 million years ago lol

    cayley playscayley playsVor 2 Tage
  • All the cool stuff happens in Russia

    J NoletteJ NoletteVor 2 Tage
  • I think its better not to know when disaster will strike...

    Christo de BeerChristo de BeerVor 2 Tage
  • Dont give 2021 any ideas please.....

    Christian SilvaChristian SilvaVor 2 Tage
  • Send a plasti-dip bomb to the object and paint it :)

    Dawn MoonDawn MoonVor 2 Tage
  • 2021 be like write that down write that down!!

    the running manthe running manVor 2 Tage
  • was watching this at 3am, fell asleep 3mins into it got up at 6am, resumed watching it and fell asleep again, his voice bru

    AClockHead103AClockHead103Vor 2 Tage
  • You should do a video measuring the effect of parenthood on your carbon footprint.

    yooser naimeyooser naimeVor 2 Tage
  • "If we saw it coming, what would we do?" Me: oof it with a nuke

    Aryan's wonderworldAryan's wonderworldVor 2 Tage
    • using nukes(depending on the size of the asteroid) to push it away from earth direction seems like a legit strategy just have to be careful to not break it

      Cutefeet CunnysseurCutefeet CunnysseurVor 9 Stunden
    • Or push it in the sun

      Aryan's wonderworldAryan's wonderworldVor Tag
    • @Naser Rasse oof the nuke in the center of the asteroid would send it in 2 parts and many small pebbles

      Aryan's wonderworldAryan's wonderworldVor Tag
    • Oof it with a nuke will send multiple asteriods

      Naser RasseNaser RasseVor Tag
  • Imagine getting a 4 billion years old rock

    ceejay lamaneroceejay lamaneroVor 2 Tage
  • The flood

    Betty the only GarnerBetty the only GarnerVor 2 Tage
  • переведи

    дима саблядима сабляVor 2 Tage
  • We might not have 10km asteroid but we have covid readyly available

    Dilip kumarDilip kumarVor 3 Tage
  • There is another coming in couple months

    Dilip kumarDilip kumarVor 3 Tage
  • Bitcoin is the future, Investing in it now will be the wisest thing to do especially with the current rise

    John MarkJohn MarkVor 3 Tage
    • Whtsap + 1 8 1 5 6 8 8 6 1 0

      John MarkJohn MarkVor 3 Tage
    • You can reach them on WhatsApp

      John MarkJohn MarkVor 3 Tage
    • No doubt Smith Trading Services is very good, I invested $5,000 and cashed out $14,700 after 3 weeks. I still wonder how they get their analysis.

      Gorge smithGorge smithVor 3 Tage
    • Hey someone talked about researching and trading without professional guide...huh I laugh you, because you will remain where you are or even make huge losses that will stop you from trading, this has been one of the biggest problems to new traders.

      Donard HazardDonard HazardVor 3 Tage
    • What do you mean by that, you think that's a nice idea😕🤷🏻‍♂?

      Aqile WilliamAqile WilliamVor 3 Tage
  • Trying to push a metior is like an ant trying to push a tank🤣🤣🤣🤣🤣

    Arthur PannellArthur PannellVor 3 Tage
  • O H Y E A H M R K R A B S

    lionskylionskyVor 3 Tage
  • So... Only God can save us. Subhanallah.

    Abdul MuminAbdul MuminVor 3 Tage
  • Him: about to get hit by a meteor. Physics: *This video was sponsored by kiwi co*

    So1usSo1usVor 3 Tage
  • *This video is sponsored by kiwi co*

    So1usSo1usVor 3 Tage
  • Nice to have some e=mc2plain things to us

    Brandi R. WoltmanBrandi R. WoltmanVor 3 Tage
  • we're totally fucked

    MarCuseusFXMarCuseusFXVor 3 Tage
  • You say "made their way to [near earth]". Isn't it more likely that they've been here the whole time, and are the results of the collision that created the moon?

    Sean CannonSean CannonVor 3 Tage
  • You keep saying "asteroid" when you mean "meteor".

    Sean CannonSean CannonVor 3 Tage
  • Love the Eero Aarnio Ball Chair

    odepoikanenodepoikanenVor 3 Tage
  • The asteroids with a gang and guns Earth running away from them and trying to dodge the bullets while we are trying to stop corona other planets be like good luck earth Ima just wait in tell u blow up

    NikolaiNikolaiVor 3 Tage
  • Me going 1000 years in the future me tp at Earth me spawn no where just space and dust🙁 is there money leftover?

    NikolaiNikolaiVor 3 Tage
  • A pebble going at the speed of light can destroy this world😂😂

    TSH_ FphitzTSH_ FphitzVor 3 Tage
  • why dont u just build bunkers under the cities

    Brutally honestBrutally honestVor 3 Tage
  • we cant even dodge a virus. humans are not as tough or smart as they think they are.

    rocket9244rocket9244Vor 4 Tage
  • now to put your mind at ease, here are many other ways we could be whiped out from

    KjelliboyKjelliboyVor 4 Tage
  • Instead of bombing the asteroid itself one can detonate the bomb near the asteroid and the force of the bomb would change the asteroids trajectory. Another thing with bombing is that one can detonate the bomb on top of the asteroid with perfect timing just before it hits Earth and thus leaving the Earth not with one giant asteroid but instead with smaller ones. Overall, enjoyed a video a lot.

    LLVor 4 Tage
  • All we have to do is call Saitama ¯\_(ツ)_/¯

    Kai PengKai PengVor 4 Tage
  • Big Astroid means big explosion time

    Jesko KoniseggJesko KoniseggVor 4 Tage
  • This was great! Your expert knew his stuff. You asked him questions normal people would like to know. Your illustrations were great. Your shots didn't last forever. The subtexts for each segment were short (5 or 6 words). Your explanations were neither too complicated nor too simplified. I'm a retired surgeon (71 y/o), used to reading scientific medical journal articles, and acquainted with statistics, calculus, physics, chemistry, and biology, etc. Over-simplification, for me, makes topics less understandable, not more. I would like you to make an episode that addresses the following problem, one that has puzzled me for years: Why do stars exist and continually appear to come into being? We observe star formation in clouds of supernova dust and debris. Heavy elements in various conglomerations are present in these interstellar clouds. The clouds look somewhat dense, but the particles seen within them are really quite rarified and look dense only because they are immense in size and block the light of stars behind them. The hydrogen gas that stars are made up of starts out as scattered ions, atoms, and molecules that mixed in with immense clouds of heavier debris. Hydrogen is the lightest element. It's elemental compound H2 is lighter than Helium. As single particules hydrogen seems an unlikely source of immense mass and gravity. Conglomerations of heavier atoms, Iron, for example would be more likely to attract H2 than the other way around. The hydrogen atoms or molecules would therefore tend to remain within such clouds and not be attracted to each other. Before this hydrogen coelesces into a star, each hydrogen particle could be miles apart moving loosely around heavier particles. It would seem that the 2nd Law of Thermodynamics would predict that hydrogen atoms, ions, and gas would tend to remain mixed in with the particles of these supernova dust clouds rather than coelescing into massive, dense objects, whose gravity exceeds that of the material that we see orbiting stars like our own star in our solar system. Star formation from clouds of supernova gas, to me, seems as likely as observing a well mixed solution of iodine in a glass of water spontaneously coelescing into a super-dense solid particle of iodine in the center of the glass of water. My son is a professor of mechanical engineering who worked at the Lawrence Livermore National Laboratory and is currently a professor of mechanical engineering at UCLA. He worked on how to create fusion reactions within the confines of a fusion reactor. Getting a few atoms of hydrogen to fuse into Helium is something that we really cannot do reliably. It takes tremendous external forces acting on previously concentrated capsules of hydrogen to cause fusion to occur. Placing hydrogen with the right mix of hydrogen isotopes into meticulously prepared containers that are then forced together by magnetic fields of tremendous power that have to be coaxed into reacting using carefully directed super lasers, or as in the case of hydrogen bombs, but placing the hydrogen strategically with in an atomic bomb. The explosion then disperses the material in these bombs all over creation. Nothing resumes its former state or form. A star ignites only after an amount of hydrogen gathers into a cluster so large and so dense that the gravity created by the lightest element or compound in the universe, which does not bind or stick together with itself. These conglomerations of hydrogen must become so huge and dense that fusion can occur giving light to the planets that revolve around these star. These enormously large and dense balls of hydrogen must also be large enough to assure that the stars formed don't blow apart and disappear. All these steps toward star formation seem ridiculously unlike to me. Yet, billions of stars, make up all of the billions of galaxies we observe in the night sky. Star formation seems to start with relatively uniform dust clouds chaotically moving and dispersing in the vacuum of space having been blown apart in supernova explosions. Somehow almost pure, concentrated collections of hydrogen gas must be pulled out of the chaotic clouds and concentrated. The balls of hydrogen must start with small collections that will tend to fall apart but somehow end up as star-sized super-dense balls of hydrogen that spontaneously ignite due to the huge gravitational forces that develop as the star grows spontaneously to enormous size. The 2nd Law of Thermodynamics tells us that atomic interactions tend to move toward less organized states than into exceedingly organized compact states. We see exceptions to that when observing life-forms. Living cells contain complex bilayers of lipophosphates that contain enzymes or proteins that are capable of excluding sodium from the cell and concentrating potassium within the cell. This process creates high external concentrations of sodium and high internal concentrations of potassium. Energy is required to maintain these concentration gradients. 30% of the energy used by our bodies is consummed by this process. Complex metabolic processes made possible by proteins created by ribosomes coupled with RNA transcribed by RNA synthetase from DNA with the help of Transfer RNA driven by ATP generated by mitochondria that use bacteria and plan-derived oxygen and carbohydrates to make the proteins that act as nanomachines to create the ion gradients needed to maintain life. Life uses energy to create order unlike any other chemical systems we know of. We can detect life by looking for samples of stuff in which entropy is locally decreasing. When we see a child's room scattered with food, videos, toys, clothes, dust, mud, etc., we know that a source of chaos has been present (usually a child). If an hour later we see that the room is clean, the clothes are clean, folded and put away, that the trash has been picked up, placed in containers, and taken out to trash bins, we know that a living, organizing, entity with the intelligence and ability to create order out of chaos has made these changes (usually an older, more experience, more intelligent, stronger and better trained and knowledgeable Mother). Whatever forces are responsible for star formation from clouds of disorganized, dispersed, and mixed clouds of matter, they appear to be creating order out of chaos in the way that life forces generate order. Whatever is responsible for star formation, it is capable of creating enormous, purified concentrations of hydrogen that are capable of forming stars that in turn organize the movement of planets, some of which are capable of sustaining life. These entropy decreasing processes seem remarkably like tasks that only intelligent life forms are capable of but on a much, much larger scale. Is it possible that star formation requires the existence of something we might call God? If not, how do we account for the existence of stars?

    Jim HopkinsJim HopkinsVor 4 Tage
  • What if we send a bomb like something near it and when it blows up and push’s it out of impact

    David SeasDavid SeasVor 4 Tage
  • Out of my control, I can't be bother to worry about it. I'll just be hopeful that science will find a way to minimize the destruction and give us warning enough to save as many lives as possible. I feel in world ending events, we could find a way to survive. When I say "we" I mean humans in some kind of form. Though life from then on would be apocalyptic. No more countries or world conflict. Technology would fall back 1 of 2 hundred years. That would be the least of the worries, but still I think we would some form...

    MagicOfDarkMagicOfDarkVor 4 Tage
  • Image if asteroids were actually *spaces, kidneys*

    Hataraku SaibouHataraku SaibouVor 4 Tage
  • I like how he's chill about knowing we could all get cooked alive in any minute.

    KhalidKhalidVor 4 Tage
  • Why don't people evacuate by foot ? a week is enough to get far from the blast by foot. Also bikes, and smaller transportation.

    Luis DiasLuis DiasVor 4 Tage
    • So where do you go then? Absorbing hundreds of thousands of new homeless and mostly jobless people is far from easy for the surrounding area.

      Релёкс84Релёкс84Vor 4 Tage
  • We deserve an asteroid strike anyway.... Humans are terrible!

    Charles RandolphCharles RandolphVor 4 Tage
  • Every one is scared after watching this video but a good way to survive an astroid blast and explosion is to get down on the ground you put your face against the ground in your hands against your head it actually works.👍👍

    Go Rangers GoGo Rangers GoVor 4 Tage
  • The innocent business individually launch because justice lamentably supply afore a weak brochure. ultra, unusual spinach

    Hadiok TasuioHadiok TasuioVor 4 Tage
  • we can save from a 1 km asteroid impacting it with 4 tsar bombs and then using impacting rockets to retrieve all the most big part preventing colision of the most big one fragment and then using the most powerful laser to desintegrate last rest but this need preparation and i dont really know if thi can be possible , just imaginating

    Alguien_Alguien_Vor 4 Tage
  • NASA when a five foot big asteroid gets within a 50 million mile range of Earth: *sweats nervously*

    Loud Bois Volume 9000Loud Bois Volume 9000Vor 4 Tage
  • The exultant teller algorithmically admit because march acromegaly man above a jobless parcel. quarrelsome, gullible gusty speedboat

    Steven JacksonSteven JacksonVor 4 Tage
  • Poor Dinosaurs. They must have been so scared :-(

    Langan's BulldogLangan's BulldogVor 4 Tage
  • Google tell me if this is true

    Rilez GamingRilez GamingVor 4 Tage
  • 16:28 But what if you ask Saitama?..

    ShicoShicoVor 4 Tage
  • "Any astroid approaching from the direction of the sun just can't be seen" Marco Inaros: Write that down! Write that down!

    Reanetse MolelekiReanetse MolelekiVor 4 Tage
    • Nice to see some The Expanse here :D Was thinking about it while watching

      Dariusz DarekDariusz DarekVor 4 Tage
  • We should take the city and push it somewhere else!

    RobhellspawnRobhellspawnVor 4 Tage
  • Thank you! Another gerat piece! You`re the best!

    tanaka314159tanaka314159Vor 4 Tage
  • This video isn’t the video to watch when your high, I’m tweaking

    Tanbozz1234 _Tanbozz1234 _Vor 4 Tage
  • the video is super great thank you for the info much apreciated for sharing this

    Raven ShadowRaven ShadowVor 4 Tage
  • Welp... Everyone give your life to god!

    The Fun OneThe Fun OneVor 4 Tage
  • I Am Not Afraid Of Death, If I See An Asteroid Coming I Will Pick My Booty And Dance

    Agnostic AthiestAgnostic AthiestVor 4 Tage
  • Quiet interesting!

    Mário BertiniMário BertiniVor 4 Tage