Earth

[Epitectus]

What energy does the earth use for its solar orbit and will it run out.

[Boris]

Kinetic energy. And yes, it will run out by dissipating energy through tidal interactions with the Sun. However, that will take a much longer time than would be required for Sun to become a red giant and destroy the Earth by engulfing it.

P.S. Such questions more properly belong in the General Astronomy forum...

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I am; therefore I think.

[This message has been edited by Boris (edited October 06, 1999).]