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Old 09-11-2008, 01:25 PM
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Default I need help in my astronomy class!?

I'm working a homework problem and i don't understand. Could someone help me and walk me through how to do this. THANKS!

The recently discovered “Xena”, which is slightly larger than Pluto, orbits the Sun every 560 .
What is its average distance (semimajor axis) from the Sun?
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Old 09-20-2008, 01:46 PM
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Very easy.
U can use Kepler`s law III
compare earth with Xena
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