Seven Minutes of Terror: NASA's Curiosity Rover to Land on Mars This Weekend

On Sunday night, NASA will land a nuclear-powered six-wheeled rover the size of a Mini Cooper with a radioactive heart and rock-vaporizing laser to the surface of Mars. Here's how to follow along.

Missed the Venus Transit in 2012? Watch It Online Until 2117

There was a little black dot on the Sun yesterday as Venus passed between it and the Earth. If you missed it, watch the transit highlights here.