Globular cluster NGC 6934, a ball of stars on the edge of our galaxy.
(Credit: ESA/Hubble; NASA)
For most of 2012, Phil Plait of Bad Astronomy tweeted a random astronomy fact every day. To kick off 2013, you can read all of those facts in one place.
Starting on 4 January 2012, Plait set himself a challenge: one astronomy fact that could fit into 140 characters for every day of 2012. He succeeded. Categorised under the hashtag #BAFacts are 367 facts, running from 4 January 2012 through to 4 January 2013: 366 for every day of the leap year, plus one extra for the last day of the tweets.
Even better, he has compiled them all in one handy Slate magazine post.
We like the series on weird moons:
BAFact: Saturn has weird moons. Iapetus is shaped like a walnut. http://is.gd/AExJiT
BAFact: Saturn has weird moons. Hyperion is like a Styrofoam ball that's been punched a zillion times. http://is.gd/tjgHhY
BAFact: Saturn has weird moons. Mimas is the Death Star. http://is.gd/mtDg4u
BAFact: Saturn has weird moons. Mimas looks like Kenny. http://is.gd/AKupLX
BAFact: Saturn has weird moons. Mimas looks like Pac-Man. http://is.gd/FcWqtV
BAFact: Saturn has weird moons. Every four years, Janus and Epimetheus swap orbits! http://is.gd/Pq2eyf
BAFact: Saturn has weird moons. Some of the water erupting from geysers on Enceladus falls on Saturn. http://is.gd/sCLOQz
Head over here for the rest, but make sure you've got some time to spare. They're pretty fascinating facts.