Does expansion of the universe decelerate orbits of planets and/or rotation of galaxies? [more inside]
posted by knave on Jun 16, 2009 - 11 answers

Why is the Big Bang possible? [more inside]
posted by Bonzai on Feb 20, 2008 - 24 answers

Would an expanding Sun really swallow the inner planets? [more inside]
posted by Burhanistan on Feb 5, 2008 - 17 answers

AstroPhysics: Why doesn't the moon move towards the earth, and other satellite related questions. [more inside]
posted by dpx.mfx on Aug 21, 2006 - 22 answers

I would like help understanding the CHANDRA xray satellite mission. [more inside]
posted by reflecked on May 4, 2006 - 7 answers

If there's anyone here who groks physics and math and astronomy and astrophysics here's a great big what-if for you. [more inside]
posted by Grod on Jan 25, 2006 - 14 answers