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What would the density of this planet be?
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| smjjames | Date: Monday, 01.10.2012, 15:27 | Message # 1 |
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| I saw this one that was 9 earth masses, 2.3 times the diameter, and yet only 1.6g, so I got to wondering how dense is this planet. I'm not sure how to calculate the density there, so, yea, that's why I'm asking.
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| apenpaap | Date: Monday, 01.10.2012, 15:39 | Message # 2 |
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| Density is mass divided by volume. So first you've got to get the mass in kilograms. Since an Earth mass is 5972 Yottagrams (6*10^24 kilograms), 9.02 of them equals 5.39*10^25 kg.
The volume of a sphere 4/3*pi*the cube of its radius, so 15103000^3*pi*4/3=8.12*10^21 cubic metres.
(5.39*10^25)/(8.12*10^21)=6638 kg/m^3. This is 6.6 kg/l, so it's a little denser than Earth, but not much.
I occasionally stream at http://www.twitch.tv/magistermystax. Sometimes SE, sometimes other games.
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| smjjames | Date: Monday, 01.10.2012, 15:53 | Message # 3 |
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| Oh, I was figuring it had a larger core since it's a super-earth in mass, but wasn't sure about overall density.
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