SUNSET: 
U Scorpii: Recurrent Nova About to Blow Up?
The recurrent nova U Scorpii leaps from 18th to 8th magnitude in just a few hours about every decade. A new prediction method says it's likely to blow in 2009. Here's where to keep watch.
Meteors That Changed the World
When "shooting stars" make the transition from heaven to earth, even small strikes can have a huge impact on human history.
