Does this violate the law of conservation of energy? What is the source of additional energy?
ljean_2363 asked:
Jupiter, Saturn, and Neptune all radiate more energy into space then they receive from the Sun.
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Jupiter, Saturn, and Neptune all radiate more energy into space then they receive from the Sun.
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When the planets formed, their interiors were extremely hot from the impacts and gravitational energy of the infalling planetesimals.
The smaller planets have had time to cool off, but the larger the mass the longer it would take to cool down.
Add to that heat generated by the radioactive decay of elements such as uranium and thorium (which is one of the known sources of heat in the Earth).
Comment by lindajune — November 26, 2008 @ 12:23 am
So it’ll take a more than a billion years for a planet to cool down? i find that hard to comprehend..hmmmm….In that same time billions of stars have formed and super novad!
Comment by bouyantox — November 28, 2008 @ 2:08 pm
Nope,
Try again. The first answerer explained this one well.
Cheers!
Comment by johnbonnechappe — December 1, 2008 @ 1:17 am