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"When Mars is at its closest point to Earth, could its gravity have an effect on us, or is it still too far away?"
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Question
Can a moon have its own satellites?
Yes probably -- depending on the moon's orbit. If the Moon is far distant from the planet, then a satellite orbit could be stable. But I do not know of any such case discovered so far. David Morrison
NAI Senior Scientist
December 5, 2005
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