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jan 12 at 22:08How to create unusual sundial?
may 4 '12 at 21:11Is there evidence of a larger universe?
may 4 '12 at 21:11Why is the universe map shaped like an oval?
may 4 '12 at 21:11What to show a beginner
may 4 '12 at 21:11What is the official difference between a planet and a dwarf planet?
may 4 '12 at 21:11Why are binary objects so critical to astronomy?
may 4 '12 at 21:11What if our Sun were located in the middle of a globular cluster?
may 4 '12 at 21:11Why doesn't helium start to fuse while there is still hydrogen fuel?