Why do planets keep rotating and revolving without losing energy?

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saket agrawal
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How do planets continuously rotate on their axis or revolve around stars ? Do the energy they consume for this continued motion gets expelled as heat ?
 

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saket agrawal said:
How do planets continuously rotate on their axis or revolve around stars ?
Explain to yourself how they can not.
 
saket agrawal said:
How do planets continuously rotate on their axis or revolve around stars ? Do the energy they consume for this continued motion gets expelled as heat ?
No energy is consumed for this. A planet in orbit has constant energy: its spin energy is constant, and its orbital kinetic energy changes by the opposite amount that its gravitational potential energy changes.

Also, if they were consuming energy (which they are not) then they would have to absorb heat (which they do not). Expelling heat would be exactly backwards.
 
Last edited:
There's no friction, so nothing slows down planets. Gravity do not "consume" any energy
 

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