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Reply #13: Note that the article says "size," not "mass." [View All]

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TheWraith Donating Member (1000+ posts) Send PM | Profile | Ignore Mon Dec-05-11 02:14 PM
Response to Reply #5
13. Note that the article says "size," not "mass."
I'm not sure if that's simply a failure of science reporting. But if they did mean size as in volume, then it doesn't necessarily follow that it would definitely have higher gravity--it would depend on the density and mass of the planet. If, for instance, it had a smaller nickel-iron core, it could be 2x the Earth's volume while actualy being less than our mass.

Jupiter, right here close to home, has over 1300 times the volume of the Earth, but only 320 times our mass. And it's "surface gravity" is only 2.5 times ours.

However, even if this planet did have twice the volume of Earth and the same average density, the surface gravity there would be only 1.26 of Earth standard. Someone who weighed 200 pounds on Earth would weigh 252 pounds there.
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  -Kepler-22b: Earth-like planet confirmed Akoto  Dec-05-11 01:06 PM   #0 
  - Maybe its made of chocolate  dipsydoodle   Dec-05-11 01:08 PM   #1 
  - Actually, warm--72 degrees! :D nt  TheWraith   Dec-05-11 01:08 PM   #2 
  - The new Florida!  glinda   Dec-06-11 01:04 PM   #48 
  - Head now to Eden, yea brother!  slackmaster   Dec-05-11 01:13 PM   #3 
  - Yeah, yeah, but does it have a double break anywhere!!  BOHICA12   Dec-05-11 01:13 PM   #4 
  - Being that it has twice the mass, wouldn't that mean everything would be heavier?  Taverner   Dec-05-11 01:14 PM   #5 
  - yep.  phantom power   Dec-05-11 01:23 PM   #6 
  - It would. But life developed here in the oceans.  immoderate   Dec-05-11 01:28 PM   #7 
  - Your weight on other worlds (link)  Jeroen   Dec-05-11 01:29 PM   #8 
  - Venus here I come! n/t  targetpractice   Dec-05-11 01:39 PM   #10 
  - Jupiter makes my butt look big. n/t.  Rozlee   Dec-05-11 02:49 PM   #17 
  - That's too cool!  Old Troop   Dec-05-11 04:14 PM   #22 
  - If the planet has a solid or liquid surface, yes. It could also be a big gas planet. nt  thereismore   Dec-05-11 01:39 PM   #9 
  - I don't think it has enough mass to be a gas planet.  immoderate   Dec-05-11 02:18 PM   #14 
     - I think you're right.  sofa king   Dec-06-11 05:59 AM   #40 
        - By my calc, it will have a gravity about 2.4 times Earth.  immoderate   Dec-06-11 09:15 AM   #44 
           - You are correct. If this planet has the same density as Earth, there is 2.4g on the surface.  thereismore   Dec-06-11 09:59 AM   #45 
              - Thanks.  immoderate   Dec-06-11 10:28 AM   #47 
  - Note that the article says "size," not "mass."  TheWraith   Dec-05-11 02:14 PM   #13 
  - Another article said 2.4 times the RADIUS of Earth,  Foolacious   Dec-05-11 03:08 PM   #19 
     - It's 2.4 times the radius - here's the NASA page:  muriel_volestrangler   Dec-06-11 09:02 AM   #43 
        - That would mean it has many, many times the surface area of Earth  KamaAina   Dec-06-11 04:39 PM   #53 
           - Nearly 6 times - area goes up as the square  muriel_volestrangler   Dec-06-11 05:40 PM   #54 
  - Yes it would. and it would change the make up of the atmosphere, too  RC   Dec-05-11 04:20 PM   #23 
  - Wouldn't suit women then  dipsydoodle   Dec-05-11 04:35 PM   #27 
  - Not twice the mass, but twice the size, there is a difference.  Bandit   Dec-06-11 10:16 AM   #46 
  - No  Ter   Dec-06-11 02:17 PM   #50 
  - It is the Meat Planet Carl Sagan talked about...  Evasporque   Dec-05-11 01:42 PM   #11 
  - Whoa!  JVS   Dec-05-11 04:27 PM   #24 
  - that's nice  SemperEadem   Dec-05-11 02:11 PM   #12 
  - 600 freaking light-years away  VWolf   Dec-05-11 02:26 PM   #15 
  - And nobody has found heaven or Allah or Jesus yet...  snooper2   Dec-05-11 04:28 PM   #25 
  - Me too. I can barely wrap my head around basic division. I should sue my high school.  zonkers   Dec-06-11 08:42 AM   #42 
     - Bwahahahahaaha!  glinda   Dec-06-11 01:08 PM   #49 
  - Quick, let's go colonize it.  GETPLANING   Dec-05-11 02:42 PM   #16 
  - Occupy Kepler 22-b!  Yo_Mama   Dec-05-11 02:54 PM   #18 
  - Unobtanium, here we come.  MilesColtrane   Dec-05-11 03:50 PM   #20 
  - Class M?  aquart   Dec-05-11 03:50 PM   #21 
  - All Kepler 22-b's base are belong to us!  No Elephants   Dec-05-11 04:33 PM   #26 
  - Kepler 22-b: Earth-like planet confirmed  iandhr   Dec-05-11 05:58 PM   #28 
  - sorry I made a duplicate post delate it please  iandhr   Dec-05-11 05:58 PM   #29 
  - TFTBR. But hey, we can dream.  HereSince1628   Dec-05-11 05:58 PM   #30 
  - Nice, a pleasant 71 degrees.  DaveJ   Dec-05-11 05:58 PM   #31 
     - Who said we haven't seen them?  Ter   Dec-06-11 02:21 PM   #51 
  - When can I move?  sarcasmo   Dec-05-11 07:42 PM   #32 
  - Tannis...nt  and-justice-for-all   Dec-05-11 08:19 PM   #33 
  - How long it would take to get to Kepler:  pettypace   Dec-06-11 01:30 AM   #34 
  - and dodging micro-asteroids all the while, which are  ngant17   Dec-06-11 04:47 AM   #36 
  - How do we really know this?  survivorista   Dec-06-11 01:51 AM   #35 
  - Ryanair to offer first budget flights to Kepler 22-b  dipsydoodle   Dec-06-11 05:07 AM   #37 
  - I bet this world looks something like this:  Odin2005   Dec-06-11 05:33 AM   #38 
  - Thanks for that link! A few hypothetic worlds await my reading pleasure!  Crop Circle   Dec-06-11 04:19 PM   #52 
  - can I go  madokie   Dec-06-11 05:37 AM   #39 
  - "Earth-like" at 2.5 g's? I think not.  mistertrickster   Dec-06-11 08:25 AM   #41 

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