"Why was it significant that the Phoenix lander found ice on Mars? Haven't we known for some time that Mars has ice caps at its poles?"
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Question
Has the moon been moving away from planet earth from the beginning? Also, does it keep moving away faster or has the rate always been about the same?
The gravitational interactions of Earth and Moon have been acting from the beginning to slow the rotation of the Earth and increase the distance from Earth to Moon. The changes depend on dissipation of tidal energy on the Earth, however, so the rate has varied as the configuration of continents and depth of the ocean have changed over geological time. David Morrison
NAI Senior Scientist
September 14, 2006
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