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    $\begingroup$ OK would whoever is flagging answers here as "not an answer" please stop? There's a description under flags explaining when they should be used, and that isn't the case for any of the answers here in this thread. If that is not clear, please consult our help center pages or stop by in our Astronomy Chat to discuss what you think might be wrong with any of the answers provided here. Flags should be used for pressing issues with posts, not to indicate your disagreement with them. That's what voting is for! Thanks! $\endgroup$
    – TildalWave
    Commented Dec 21, 2013 at 18:58