There is already a backup Celestia Forum at www.celestialvisions.net , so I am just going to link there.

Celestia Forum (Use this if www.shatters.net is Working):

www.shatters.net/forum

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Backup Celestia Forum (Use this if www.shatters.net is Down):

http://www.celestialvisions.net/forums/index.php?s=9c6327d2acb95997bf587862c2395fb3&act=idx