A new report lays out the objectives for a crewed mission to Mars. Plus, an update on the NASA mission to survey the asteroid ...

Zipping toward Earth at around 20,000 miles per hour, the asteroid is due to make its closest approach on Tuesday.

Chinese researchers want to send more than 20 of China's largest rockets to practice turning away a sizable asteroid - a technique that may eventually be crucial if a killer rock is on a collision ...