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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 August 19th, 2008 |
One answer
| 1 person likes this
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 August 3rd, 2008 |
One answer
| 1 person likes this
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