The X-37B Orbital Test Vehicle, which wasn't officially on a secret mission though it raised various alarms when it disappeared for two weeks, has returned.  

Tracking X-37B was a delight for amateur astronomers since, let's be honest, you can't really keep a secret in the sky from them.   While NASA employees were drinking coffee, an amateur found a gaping hole in Jupiter, so not a lot gets by unpaid sky watchers.

Why is X-37B of so much interest?   Because it is a low orbit space vehicle but can be landed on a runway with a joystick.   The Boeing craft (launched on a Lockheed-Martin Atlas V, so it is different than a space shuttle ) was testing a number of advanced aerospace components.    It weighs 11,000 pounds, is 9 1/2 feet tall and over 29 feet long and has a wingspan of less than 15 feet.

Returning from its classified mission of 7 months, it was declared a success and will go back up spring 2011, according to the Air Force.