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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 03:14 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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