Did a Planet Escape the Solar System?

  • Added:  1 month ago
  • Astronomers still aren't sure about how our solar system might have formed, but they have simulations to help them get closer to the answer!

    Planet 9: https://www.youtube.com/watch?v=I0thBlCkSdI
    Were the Planets Always in the Same Order?: https://www.youtube.com/watch?v=UYMsaFcv83Y

    Hosted by: Caitlin Hofmeister
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    Nice model: https://en.wikipedia.org/wiki/Nice_model#/media/File:Lhborbits.png
    Rogue planet: https://en.wikipedia.org/wiki/Rogue_planet#/media/File:Alone_in_Space_-_Astronomers_Find_New_Kind_of_Planet.jpg
    Star System: https://commons.wikimedia.org/wiki/File:A_cosmic_couple.jpg
    Planet Nine: https://commons.wikimedia.org/wiki/File:Planet_nine_artistic_plain.png
  • Video CategoriesEducation
  • Runtime: 3:54
  • Tags for this video:  scishow  scishow space  Space  Science  hank green  astrophysics  astronomy  Caitlin  Hofmeister  lost planet  planet nine  solar system  simulation  rogue planet  physics  jupiter  saturn  uranus  ice giant  extra planet  ninth planet  ejected planet  mars  rocky disk  astronomer  planetesimal  nice model  orbit  tardis  outer planets  lost  planet  

Comments: 552

  • Mikkåel Yvessen
    Mikkåel Yvessen 4 days ago

    What's the most stupid thing (in my opinion) is that we know more about outer space than our own planet. For example, we know less than 2% of the Earth's oceans. We should start by exploring our own planet before trying to know what's laying out there.

  • Tyler James
    Tyler James 4 days ago

    I come for the science, but stay for the beautiful lady. She is somethin else.

  • Brett Henning
    Brett Henning 9 days ago

    Caitlin, you're a great host, but I wish you would slow down a little. You talk so fast it's hard to keep up! And I think because you're talking so fast, it comes off more like you're just reading a script. If you slow down, it'll be more like you're talking to us instead of at us if that makes sense. Keep up the great work!

  • Rusty Shackelford
    Rusty Shackelford 16 days ago

    Imagine colonizing a rogue planet and setting up huge underground bases. (Unlikely it'll be getting enough light to sustain our kind of life)

  • Pablo Steelio
    Pablo Steelio 16 days ago

    What's the hurry? Breath girl and take the marbles out of your mouth.

  • Abdulrahman Alsaleh
    Abdulrahman Alsaleh 17 days ago

    stop talking about my anus lady!!

  • Clarence A. P.
    Clarence A. P. 18 days ago

    SciShow food

  • Robert S
    Robert S 24 days ago

    wow she talks fast!

  • Andrea Calaon
    Andrea Calaon 25 days ago

    Ridiculous audio speed

  • Angelika Skoroszyn
    Angelika Skoroszyn 1 month ago

    The idea of a rogue planet traveling through the space without any star to bind it in one place is pretty romantic o:

    Or maybe my unconscious is trying to say me it's time to find a mate and make children so I just see things

  • The Primal Earth
    The Primal Earth 1 month ago

    so your telling me that there could be ten planets? but one of them was ejected and the other was planet 9?

  • Nyajinsky
    Nyajinsky 1 month ago

    not trying to be mean, but maybe you could try to smile less and be less exciting about this because it was really distracting. like: "yaay, bla bla, yaaay". and you are like this in every video. ... sorry, just a suggestion.

  • Brandon Ale'ee
    Brandon Ale'ee 1 month ago

    ....do you even blink? Trying to see if you blinked was distracting me from the interesting facts lol

  • Ryan Low
    Ryan Low 1 month ago

    Wait, an undiscovered extra planet that was ejected from our solar system long ago?

    Call it Mondas.

  • Player_1
    Player_1 1 month ago

    What if it is now the Moon and Asteroid belt?

  • s vanner
    s vanner 1 month ago

    Is it just me or does this whole exercise seem completely pointless? The only data points we have to go by are in the last few moments (cosmically speaking) of the solar system's life, and we think we can extrapolate that back to its origin?

    You may as well try to extrapolate what I had for breakfast on the 13 May 1985 based on my last three week's breakfasts! It is complete guess work when we can't even be sure how old our solar system is, or indeed the age of any of the planets in the solar system. Yes, we have numbers handed to us about the age of these planetary bodies, but those ages also come with contradictory data, refuting those ages.

  • LeeroyJenkins94
    LeeroyJenkins94 1 month ago

    Yes, Becasue of Chuck Norris' Roundhouse kick !

  • fung whyou
    fung whyou 1 month ago

    Thought what if the planet that's missing was the one that crashed into the earth when it was still molten and created the Moon

  • Trancor
    Trancor 1 month ago

    What ever happened to the planet Sedna?

  • RagingGamerzNation
    RagingGamerzNation 1 month ago

    i cant help but notice the nose

  • quensoueu1
    quensoueu1 1 month ago

    Now I can't listen people saying Uranus without laughing, thank you internet

  • S Brad
    S Brad 1 month ago

    my anus is still here 😐

  • Lars Asi
    Lars Asi 1 month ago

    i'm sry I know this is super hate but its hard watching these videos with this woman like dont you have any better looking people for this channel. again I know this is super hateful but its true

  • dfjshjkd
    dfjshjkd 1 month ago


  • Claire H.
    Claire H. 1 month ago

    I love this host! She is so cute and excited!

  • Doug sillig
    Doug sillig 1 month ago

    is she sick or has allergies? she sounds like she has a snotty nose and red blotchy skin

  • Jan Christian Frodahl

    As massive as uranus!?

  • Orthagoni
    Orthagoni 1 month ago


  • Frank Harr
    Frank Harr 1 month ago

    What if it were an extra star?

  • richety cricket
    richety cricket 1 month ago

    nibiru ..duh

    SERVO DESTROYER 1 month ago

    Not my anus, your anus.

  • dominick schirripa
    dominick schirripa 1 month ago

    PLUTO! You forgot Pluto. It's the best planet

  • William Shreckengost

    "[...]Our solar system might have once had a whole extra planet that got kicked out[...]" Pluto is gonna be pissed.

  • Rix Xir
    Rix Xir 1 month ago

    Why there is some weird background noise throughout video? Can be heard especially in 3:20 and 3:30. Like someone writing something down on a piece of paper.

    Something is wrong with your microphone probably lol.

  • Ken Oakleaf
    Ken Oakleaf 1 month ago

    Could have simulated and explained the gravitational ejection better

  • Tizedboy Zilipendwa Channel

    Stupid narration on this channel

  • thedakon
    thedakon 1 month ago

    Please stop editing out the normal pauses in human speech just to gain an extra minute!

  • kirby march Barcena
    kirby march Barcena 1 month ago

    A rogue planet that could not be located?Its probably playing hide and seek

  • Ebumbaya '
    Ebumbaya ' 1 month ago

    2:15 But kicking a planet out, requires energy and thereby reduces the overall energy of the remaining system, right?

  • conflectiz
    conflectiz 1 month ago

    Hahahahahaha. The fucking Allstate ad is worst than this stupid fucking video.

  • antjasemrome
    antjasemrome 1 month ago

    I'm still bitter about pluto!! f the other dwarfs the 1st one should always count

  • Enoc Velazquez
    Enoc Velazquez 1 month ago

    Caitlin looks like a cute baby pirana! Love her fun personality!

  • Zormac
    Zormac 1 month ago

    "yoor-ANUS"? I thought it was supposed to be pronounced "YOOR-uh-nus" to avoid that kind of problem.

  • K Camera
    K Camera 1 month ago

    Great subject and explanation. But...you talk way too fast! You have a nice voice but try to slow it down just a little.

  • watts300
    watts300 1 month ago

    She's so cheery and happy to be there. :)

  • Philosopher8659
    Philosopher8659 1 month ago

    Of all the things there is to know, all of the things essential to improving life on this planet, we have air heads of all types daydreaming bull-shit.


    A Universal Language.


    The human race is demonstrably proto-linguistic.

    Every bit of the above work is based on what mankind has traditionally called impossible to demonstrate.

    I did not find it that hard.


  • ABetterWeapon
    ABetterWeapon 1 month ago

    That's a Bajoran dress, isn't it?

  • De Apenhoofd
    De Apenhoofd 1 month ago

    One would think that in order for the gas giants to migrate outward faster, the rogue planet should actually have been tossed into the sun.

  • Lakshaydeep
    Lakshaydeep 1 month ago

    can scishow make a series of video on blackholes from birth to death

  • FrighteningSpoon
    FrighteningSpoon 1 month ago

    Mass of Uranus... huehuehue

  • FrighteningSpoon
    FrighteningSpoon 1 month ago


  • ArcMedicalResearch
    ArcMedicalResearch 1 month ago

    It left without me :(

  • alertonoff 4
    alertonoff 4 1 month ago

    can anyone recommend some freeware 3d bubblechart multimedia software ?

  • Love Tap
    Love Tap 1 month ago


  • Gregory Samuel Teo
    Gregory Samuel Teo 1 month ago

    sooo... Gallifrey could've come from our solar system?

  • kolby4078
    kolby4078 1 month ago

    is this sped up slightly?

    • watts300
      watts300 1 month ago

      Nope. That's just Caitlin... and editing to remove breaths.

  • Royall Bryson Frazier

    We did used to have an extra planet.. rip Pluto *tear*

    • watts300
      watts300 1 month ago

      Psh... that's so 11 years ago. You've had time to recover. Dry your eyes.

  • Zutaca
    Zutaca 1 month ago

    Why is there hair around Uranus?

  • Doctor Dalek
    Doctor Dalek 1 month ago


  • devHoodie
    devHoodie 1 month ago

    This video has way too much bass.

  • slade steinagel
    slade steinagel 1 month ago

    the way she said uranus

  • Bob M
    Bob M 1 month ago

    Why did a planet escape the solar system around my anus?

  • Sharan Sajiv Menon
    Sharan Sajiv Menon 1 month ago

    Subscribe to my channel

  • Feral Sparrow
    Feral Sparrow 1 month ago

    how much money would it cost to do daily videos on sci show space

  • Daakkon
    Daakkon 1 month ago

    You need to do a video specifically about Uranus.

  • colinp2238
    colinp2238 1 month ago

    What about the Asteroid and Kyper belts? Maybe they had formed as planets but been torn apart by the outer giants' gravity?
    What happened to Theia after it impacted the Earth?

  • Siegfried Pretsch
    Siegfried Pretsch 1 month ago

    the super fast editing is most annoying

  • MrReierz
    MrReierz 1 month ago

    So lets get this straight, you have to lose one planet to shift the gigantic gass giant jupiter out just a litle bit? So there should be many planets doing this in order to make a stabil orbit. Thats just weird, you got to invent many planets to explain a single one. How is that a good theory? What really annoys me is that many scientists does not admit they have a fundamental problem with their model, and use the absense of evidence to explain how "things must be". Its circular reasoning.

  • Clark Balatbat
    Clark Balatbat 1 month ago

    That's a really NICE model ;)

  • Grubiantoll
    Grubiantoll 1 month ago

    So there are no families without conflicts,
    not ewen our solar family

  • Prateek Guha
    Prateek Guha 1 month ago

    yes we had an extra planet but it was thrown out due to science itself. And the planet's name is PLUTO..😅😂

  • Phụng Ngô Hải
    Phụng Ngô Hải 1 month ago

    The one that got away.

  • Onat _
    Onat _ 1 month ago

    I have always thought that Venus was counter rotating when compared other planets was because it was a rogue planet and got caught by the Sun.I wonder what does the simulations look like when Venus is captured later than we originally think of ? Does Venus being captured provide the required amount of energy to push the gas giants outwards ? I would be glad if someone could explain this to me.

  • Levi
    Levi 1 month ago

    Not an expert or anything.. But couldn't these scientists run a backwards simulation? they start with the current solar system backwards to the born of our sun

  • Carl CIFER
    Carl CIFER 1 month ago

    Next "Is the asteroid belt once a planet that's been destroyed by space rangers?"

  • TheViciousMoob
    TheViciousMoob 1 month ago

    Hahahaha tardis joke xdd

  • Manfred Höffken
    Manfred Höffken 1 month ago

    The story of a planet, unconnected to any star or solar system, travelling the endless void of the universe all by itself makes me sad.

    MOEMUGGY 1 month ago

    It's 2017. Why are people still pronouncing Uranus, "Your-Anus"?? It's "Ur-an-us"
    Why don't we just call it, "Your-Rectum"

  • Ben Rollman
    Ben Rollman 1 month ago

    I remember when I was a child there was the idea that the asteroid belt could have been a planet. Is that theory no longer in play? I suppose I could look for myself.

  • Devil's Reaper Gaming

    the Solar system was probably just stretching real hard and accidentally kicked the planet

    or planet had an affair with the Solar system and she got mad and kicked his ass out

  • MrOvimik
    MrOvimik 1 month ago

    Hah she said Uranus again!

  • TheCimbrianBull
    TheCimbrianBull 1 month ago

    I once let one slip near Uranus.

  • Manuel Cabezas
    Manuel Cabezas 1 month ago

    cool video,
    I have a question. The solar system is a chaotic system, which makes almost impossible to predict its long-term behavior. For the same reason, it is equally hard to reconstruct its past. Do you know how the simulations circumvent this problem? Thanks!

  • Jim Fortune
    Jim Fortune 1 month ago

    "still trying to figure out how many planets our solar system started with" No. We're still trying to figure out how many planets our solar system has right now!

  • Ohem1
    Ohem1 1 month ago

    *heavy inhale* Nibiru

  • Erik Liles
    Erik Liles 1 month ago

    Why do they not allow pauses between statements.? The editing style makes each video one long run on sentence.

  • blub
    blub 1 month ago

    @02:53 "with about as much mass as your anus and Neptune"

  • Evan Hickman
    Evan Hickman 1 month ago

    as much mass as your anus..... LMAO

  • Otherstuff
    Otherstuff 1 month ago

    A planet did not have to be ejected, it could have been destroyed and the same result may have occured. The astoroid belt was once another planet. Also your opening statement is false. The solar system has not been the same for billions of years.There is evidence that our system has undergone changes within the time of man. WORLDS IN COLLISION by IMMANUEL VELIKOVSKYEarth used to have an orbital period of 360 days.

  • James J.
    James J. 1 month ago

    The planet being ejected provided energy? or the energy required means a planet was likely ejected? also the graphic at 1:30 ish is confusing, and based on my KSP experience incorrect ;P (great show, just feel like being contrary)

  • Falcrist
    Falcrist 1 month ago

    OMG THANK YOU for saying Uranus correctly. I still can't stand when people call it urine-us.

  • poephila
    poephila 1 month ago

    Can we see one of those successful simulations somewhere? All I can find are planet simulator games!

  • Shwappler
    Shwappler 1 month ago

    I heard NASA is going to blow their load on Uranus soon...also just like anyone can see now Uranus on any given night if they look for it.

  • Thomas H
    Thomas H 1 month ago

    Did Neil Degrasse Tyson have something to do with it?

  • Lazarus The adventurer


  • Knight and Crow
    Knight and Crow 1 month ago

    This dress looks so good on her!

  • Lucy Kelly
    Lucy Kelly 1 month ago

    According to some legends a planet called Tiamat was once in our solar system. Im not sure if it came from elsewhere or not. It was struck by another planet which was travelling through our solar system and it was split into Earth and Mars. Today I believe astronomers say Mars is very much like Earth is. Also we are visited every 3,600 odd years by Nemesis a red dwarf star so it or its planets could have collided with Tiamat. Try these possibilities in your models. No Earth or Mars, or a planet the size of Earth and Mars combined. Maybe they will work.

    Also try to figure in regular disruption caused by a red dwarf star and its planets. See it that works.

  • Pointless Bunkum
    Pointless Bunkum 1 month ago

    It's probably down the back of the sofa.

  • Kevin Arnold
    Kevin Arnold 1 month ago

    4 Iraqi planets??

  • Silent Umbra
    Silent Umbra 1 month ago

    Nibiru af

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