Thread: 'Second Earth' found, 20 light years away
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Old 10-17-2007, 05:23 PM   #68
evman150
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Quote:
Originally Posted by badnarik View Post
The question "How many light years is mars away?" indicates that the person asking knew it was a measure of distance.

What is the proper way to measure the distance to Mars?
Realistically, in kilometres.

Ideally, in Astronomical Units.

1 AU = Mean Earth-Sun Distance = 1.5E11m
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