X-37B robot plane has its mission extended past 270 days in continuous flight. The mission of the X-37B is unknown.
The Mars Science Laboratory, or Curiosity rover, lifted off from the Cape Canaveral Air Force Station in Florida. After an 8 1/2-month journey, the rover is expected to arrive at the Red Planet in August 2012.
NASA's Mars Science Laboratory, which includes the car-sized Curiosity rover, arrived on its Cape Canaveral launchpad on Thursday. But some experts worry about the lack of funding for Mars missions beyond 2013.
The size of a small car, NASA's one-ton Curiosity Mars rover contains twice the number of scientific instruments as its predecessors, plus a drill that will allow it to bore into the Red Planet's rocks.
Falling satellite trackers at NASA say it will hit Friday night or Saturday morning and has a small chance of crashing in the US. But the precise track and timing of the falling satellite is still hard to predict. What is known is that events like this have happened before. From NASA rockets to Soviet satellites – including debris that actually hit someone – the history of falling space junk is long. Here are 10 other pieces of space junk that have survived the blazing voyage through Earth's atmosphere.
The V-2 rocket, pictured here in 1944, was a German ballistic missile developed at the beginning of WWI. Both the US and Soviet space programs were founded on V-2 technology, having employed the German rocket scientists after World War II.