How can I give my girlfriend an engagement ring with a stone made of moon rock? [more inside]
posted on Jan 23, 2008 - 20 answers

Hypothetical from Moon-orbit to Earth-orbit question. I already know about free return trajectories, but what if something went wrong and your ship (currently orbiting the moon) didn't leave lunar orbit at the point it was supposed to? What might happen? [more inside]
posted on Aug 17, 2006 - 8 answers

Help me with the hard science behind a sci fi idea. [more inside]
posted on Jun 22, 2006 - 19 answers

Why are people so hung up on Lunar Helium-3? What do we need it for? [more inside]
posted on Sep 23, 2005 - 3 answers

What could obscure the moon temporarily at night? The ghost thread reminded me of this weird event, and I wondered if you clever folk might be able to speculate.. [mi]
posted on Dec 31, 2004 - 9 answers