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MeMySelfAnEye answered your question A typical comet contains 10^13 kg of water ice. How many comets would have to strike Earth to account for the 2x10^21 kg of water found on our planet? If this amount of water accumulated over .5 billion years, how frequently was Earth hit by comets? on 08/19/08 at 6:31 pm.
yeroco answered your question How long does a radar signal take to travel from Earth to Mercury and back when Mercury is at its closest point to Earth? on 08/03/08 at 10:09 pm.
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