I know I just posted a space picture from the Big Picture Advent Calendar, but this one is REALLY cool:

Each of those specks is a galaxy–which in turn has billions (and billions) of stars in it. The photo caption tells me that, “The amount of mass in this sea of galaxies is huge, and is great enough to visibly bend the fabric of spacetime.” Mind boggling!

(And speaking of spacetime, have all the Dr. Who fans seen this video? Jason wrote about it Monday and it made my day.)