Science in 140 characters: What scientists are tweeting about

Dent in the ring
Commander Chris Hadfield, Astronaut | @Cmdr_Hadfield
NASA’s Cassini spacecraft that is orbiting Saturn has sent back photos last week that show a massive smudge in the planet’s ‘F ring’, according to photos tweeted by retired Canadian astronaut Commander Chris Hadfield. The thin and wispy F ring is the outermost ring of Saturn, which lies outside the main group of rings. NASA scientists say the deviation was most likely caused by the interaction betw