Mission to Mars: How far can we push the edge?

In space, there's no room for error and no time for hesitancy. Astronauts depend on crucial communications from mission control just to stay alive. But the further you travel from Earth, the longer it takes to send and receive messages.

And with sights firmly set on Mars, how do we overcome the 20-minute communication lag to the red planet? The answer, take an all-knowing supercomputer with you to do the big calculations and make the tough calls instead.