These are the asteroids to worry about

30 nóv 2020
6 746 495 Áhorf

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

  • Why worry about things you can’t control

    PollutedMINDSPollutedMINDS6 klukkustundum síðan
  • The nappy passbook baly wonder because viola phylogentically tie before a ubiquitous dashboard. true, bizarre meal

    Even LuisEven Luis6 klukkustundum síðan

    Zoomie the Gaming AIZoomie the Gaming AI6 klukkustundum síðan
  • The synonymous knickers largely grip because magic algorithmically bubble in a chief continent. scintillating, ill titanium

    darek klichdarek klich10 klukkustundum síðan
  • He's lucky that god didn't get any ideas

    Owen MarshallOwen Marshall10 klukkustundum síðan
  • I would simply intervene

    LucidTripLucidTrip11 klukkustundum síðan
  • Hopefully an undercover bomb to land on CHINA!

    Sissy BSissy B11 klukkustundum síðan
  • 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 11213 klukkustundum síðan
  • so they missed the one over Russia , funny that , aye !

    Thomas W.glasgowThomas W.glasgowDegi Síðan síðan
  • Males me feel real, like we living on a rock hurtling through space.

    RobRobDegi Síðan síðan
  • 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 DriveDegi Síðan síðan
  • Comet's?

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

    AchievedHeavenAchievedHeavenDegi Síðan síðan
  • Guys relax, y'all gonna forget this in two days.

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

    basildon davebasildon daveDegi Síðan síðan
  • Holland Taylor

    martalex sinmartalex sinDegi Síðan síðan
  • Hello I love your video so much🔰🌻🍎🍍🌺🐹

    My cute hamsterMy cute hamsterDegi Síðan síðan
  • O man

    Gasper AntonyGasper AntonyDegi Síðan síðan
  • 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 RDegi Síðan síðan
  • An asteroid would probably hit the water though

    KurtSandfordKurtSandfordDegi Síðan síðan
  • This documentary was so interesting. It’s so important to learn about astronomy. And so fascinating.

    SuperThunderGoodGuySuperThunderGoodGuyDegi Síðan síðan
  • Debbie Downer's Father

    SpaghettibenderSpaghettibenderDegi Síðan síðan
  • Last time I was watching or of this I woke up to formula drift so I’m down

    SABean RPuffSABean RPuffDegi Síðan síðan
  • here we go 2021 trailer

    simon morenosimon morenoDegi Síðan síðan
  • Thats why we need to take care the mother earth

  • Hahahahaha fake

    Abs SupremeAbs Supreme2 dögum síðan
    • Ya wannabe naruto profile I bet you are one of those flat earthers or just joking

      Owen MarshallOwen Marshall10 klukkustundum síðan
  • The material hammer univariately murder because offer ultimately rely aboard a actually drawbridge. loud, disgusting conga

    Bryan GoldfieldBryan Goldfield2 dögum síðan
  • So we giving Jupiter a demerit for this one, or?

    のぢGreyのぢGrey2 dögum síðan
  • Fact: Duende/duwende in Filipino means "dwarf" in English

    Jay Vinson DahayJay Vinson Dahay2 dögum síðan
  • mmmm remove the "a" from asteroids

    arcimedesarcimedes2 dögum síðan
  • 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 Gaming2 dögum síðan
  • The last astroid hit 66 million years ago lol

    cayley playscayley plays2 dögum síðan
  • All the cool stuff happens in Russia

    J NoletteJ Nolette2 dögum síðan
  • I think its better not to know when disaster will strike...

    Christo de BeerChristo de Beer2 dögum síðan
  • Dont give 2021 any ideas please.....

    Christian SilvaChristian Silva2 dögum síðan
  • Send a plasti-dip bomb to the object and paint it :)

    Dawn MoonDawn Moon2 dögum síðan
  • 2021 be like write that down write that down!!

    the running manthe running man2 dögum síðan
  • was watching this at 3am, fell asleep 3mins into it got up at 6am, resumed watching it and fell asleep again, his voice bru

    AClockHead103AClockHead1032 dögum síðan
  • You should do a video measuring the effect of parenthood on your carbon footprint.

    yooser naimeyooser naime2 dögum síðan
  • "If we saw it coming, what would we do?" Me: oof it with a nuke

    Aryan's wonderworldAryan's wonderworld2 dögum síðan
    • Or push it in the sun

      Aryan's wonderworldAryan's wonderworldDegi Síðan síðan
    • @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 wonderworldDegi Síðan síðan
    • Oof it with a nuke will send multiple asteriods

      Naser RasseNaser RasseDegi Síðan síðan
  • Imagine getting a 4 billion years old rock

    ceejay lamaneroceejay lamanero2 dögum síðan
  • The flood

    Betty the only GarnerBetty the only Garner2 dögum síðan
  • переведи

    дима саблядима сабля2 dögum síðan
  • We might not have 10km asteroid but we have covid readyly available

    Dilip kumarDilip kumar2 dögum síðan
  • There is another coming in couple months

    Dilip kumarDilip kumar2 dögum síðan
  • Bitcoin is the future, Investing in it now will be the wisest thing to do especially with the current rise

    John MarkJohn Mark2 dögum síðan
    • Whtsap + 1 8 1 5 6 8 8 6 1 0

      John MarkJohn Mark2 dögum síðan
    • You can reach them on WhatsApp

      John MarkJohn Mark2 dögum síðan
    • 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 smith2 dögum síðan
    • 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 Hazard2 dögum síðan
    • What do you mean by that, you think that's a nice idea😕🤷🏻‍♂?

      Aqile WilliamAqile William2 dögum síðan
  • Trying to push a metior is like an ant trying to push a tank🤣🤣🤣🤣🤣

    Arthur PannellArthur Pannell3 dögum síðan
  • O H Y E A H M R K R A B S

    lionskylionsky3 dögum síðan
  • So... Only God can save us. Subhanallah.

    Abdul MuminAbdul Mumin3 dögum síðan
  • Him: about to get hit by a meteor. Physics: *This video was sponsored by kiwi co*

    So1usSo1us3 dögum síðan
  • *This video is sponsored by kiwi co*

    So1usSo1us3 dögum síðan
  • Nice to have some e=mc2plain things to us

    Brandi R. WoltmanBrandi R. Woltman3 dögum síðan
  • we're totally fucked

    MarCuseusFXMarCuseusFX3 dögum síðan
  • 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 Cannon3 dögum síðan
  • You keep saying "asteroid" when you mean "meteor".

    Sean CannonSean Cannon3 dögum síðan
  • Love the Eero Aarnio Ball Chair

    odepoikanenodepoikanen3 dögum síðan
  • 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

    NikolaiNikolai3 dögum síðan
  • Me going 1000 years in the future me tp at Earth me spawn no where just space and dust🙁 is there money leftover?

    NikolaiNikolai3 dögum síðan
  • A pebble going at the speed of light can destroy this world😂😂

    TSH_ FphitzTSH_ Fphitz3 dögum síðan
  • why dont u just build bunkers under the cities

    Brutally honestBrutally honest3 dögum síðan
  • we cant even dodge a virus. humans are not as tough or smart as they think they are.

    rocket9244rocket92443 dögum síðan
  • now to put your mind at ease, here are many other ways we could be whiped out from

    KjelliboyKjelliboy3 dögum síðan
  • 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.

    LL3 dögum síðan
  • All we have to do is call Saitama ¯\_(ツ)_/¯

    Kai PengKai Peng3 dögum síðan
  • Big Astroid means big explosion time

    Jesko KoniseggJesko Konisegg3 dögum síðan
  • 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 Hopkins3 dögum síðan
  • What if we send a bomb like something near it and when it blows up and push’s it out of impact

    David SeasDavid Seas4 dögum síðan
  • 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...

    MagicOfDarkMagicOfDark4 dögum síðan
  • Image if asteroids were actually *spaces, kidneys*

    Hataraku SaibouHataraku Saibou4 dögum síðan
  • I like how he's chill about knowing we could all get cooked alive in any minute.

    KhalidKhalid4 dögum síðan
  • 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 Dias4 dögum síðan
    • 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.

      Релёкс84Релёкс843 dögum síðan
  • We deserve an asteroid strike anyway.... Humans are terrible!

    Charles RandolphCharles Randolph4 dögum síðan
  • 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 Go4 dögum síðan
  • The innocent business individually launch because justice lamentably supply afore a weak brochure. ultra, unusual spinach

    Hadiok TasuioHadiok Tasuio4 dögum síðan
  • 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_4 dögum síðan
  • NASA when a five foot big asteroid gets within a 50 million mile range of Earth: *sweats nervously*

    Loud Bois Volume 9000Loud Bois Volume 90004 dögum síðan
  • The exultant teller algorithmically admit because march acromegaly man above a jobless parcel. quarrelsome, gullible gusty speedboat

    Steven JacksonSteven Jackson4 dögum síðan
  • Poor Dinosaurs. They must have been so scared :-(

    Langan's BulldogLangan's Bulldog4 dögum síðan
  • Google tell me if this is true

    Rilez GamingRilez Gaming4 dögum síðan
  • 16:28 But what if you ask Saitama?..

    ShicoShico4 dögum síðan
  • "Any astroid approaching from the direction of the sun just can't be seen" Marco Inaros: Write that down! Write that down!

    Reanetse MolelekiReanetse Moleleki4 dögum síðan
    • Nice to see some The Expanse here :D Was thinking about it while watching

      Dariusz DarekDariusz Darek4 dögum síðan
  • We should take the city and push it somewhere else!

    RobhellspawnRobhellspawn4 dögum síðan
  • Thank you! Another gerat piece! You`re the best!

    tanaka314159tanaka3141594 dögum síðan
  • This video isn’t the video to watch when your high, I’m tweaking

    Tanbozz1234 _Tanbozz1234 _4 dögum síðan
  • the video is super great thank you for the info much apreciated for sharing this

    Raven ShadowRaven Shadow4 dögum síðan
  • Welp... Everyone give your life to god!

    The Fun OneThe Fun One4 dögum síðan
  • I Am Not Afraid Of Death, If I See An Asteroid Coming I Will Pick My Booty And Dance

    Agnostic AthiestAgnostic Athiest4 dögum síðan
  • Quiet interesting!

    Mário BertiniMário Bertini4 dögum síðan
  • The married poison preliminarily brush because lasagna clinicopathologically concern regarding a chubby gas. mute, hospitable worm

    alex hebertalex hebert4 dögum síðan
    • word

      geirtwogeirtwo4 dögum síðan
  • What if when the atroides are on the way to earth what about adding weight on one side then maybe it will change its center of gravity and maybe change its course

    vaskemaskinvaskemaskin4 dögum síðan
  • Just give me more fricking anxiety, not like i have a lot during these times

    FatRodent RatFatRodent Rat4 dögum síðan
  • When I was like, 11 or 12 or so, I had been obsessed with the the world being destroyed by a asteroid impact. Now, I don’t care anymore, I learned that there isn’t anything you could do, but the chances are so, so very low. So don’t freak out. It will not hit, you won’t die! Now go eat some pizza rolls, and have a conversation with someone, your ok. :)

    AnonymousAnonymous4 dögum síðan
  • If you nuke a asteroid into small enough pieces, wouldn't it increase the surface area and cause it to burn up in the atmosphere more quickly?

    suckmylolsuckmylol4 dögum síðan
  • try to study the Quran. you will find many miracles

    ABCABC4 dögum síðan
  • This man is so full of s*** on so many issues. He thinks that because we know some of the near Earth objects that we can calculate for the ones that are outside of the system? He has no idea what he's talking about. There is no way to track asteroids outside of our system at all. There could be an incredibly large asteroid headed our way for an inevitable strike in a straight shot after being slung around planets and stars. It is not unfeasible for an asteroid to be traveling near the speed of light. And if it was coming straight at us we would never really know till it was too late. Funny part is the Bible predicts many asteroids falling in the future and some of these enable specific events to occur.

    Archangel MetatronArchangel Metatron4 dögum síðan
  • He's also neglecting the fact that it flash fried megatons of water causing enormous amounts of water vapor to accumulate in a cumulonimbus clouds.

    Archangel MetatronArchangel Metatron4 dögum síðan
  • When that asteroid hit it rained for 40 days and 40 nights and blotted out the Sun for at least that long causing hyper cooling at the poles that continued cooling toward the equator. In other words it caused the ice age that occurred after the global flood that Noah lived through.

    Archangel MetatronArchangel Metatron4 dögum síðan
  • Those dates are so wack it's ridiculous.

    Archangel MetatronArchangel Metatron4 dögum síðan
  • Dynamical chaos just means you can't calculate it. But you could if you saw more and had better computers. Unfortunately there are so many objects working in the universe that it is inevitable that asteroids will hit this planet. It is 100% inevitable.

    Archangel MetatronArchangel Metatron4 dögum síðan
  • guess I'm not sleeping tonight

    Ohbi MononimoOhbi Mononimo4 dögum síðan