Which of these methods of heating a planet is least likely to decline over the lifetime of the Solar System?
Which of these methods of heating a planet is least likely to decline over the lifetime of the Solar System?
Which of these methods of heating a planet is least likely to decline over the lifetime of the Solar System?
a) Heating by accretion
c) Heating by the Sun
d) Heating by radioactive decay
e) Heating by gravitational contraction
C, the Sun
It will not burn like it does for ever. It will turn into a red giant and then back down to a white dwarf and then ultimately burn out.
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May 16th, 2010 at 12:12 am
E- Gravity does not grow weaker nor does the mass change that much.
I am defining the lifetime of the solar system as up to the point were the sun goes red giant because at tha point, the 3-4 inner planets might be vaporized.
Accreation is over, radioactive decay get weaker as less material is around to decay, and the sun will remain relatively constant by my defined endpoint. So I guess c could count as well.