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Stefano Borini earned this badge 6 times |
jan 24 at 17:33
The speed of gravity?
jun 3 '12 at 23:33
Lenses (refractor) or mirrors (reflector) telescope?
may 4 '12 at 20:35
(post deleted or otherwise unavailable)
may 4 '12 at 20:35
Why is M42 red in the pictures, but green when observed at the eyepiece?
dec 23 '10 at 21:04
Experimental observation of matter/antimatter in the universe
