NASA is going to Mars. This much we know -- but the devil is in the details. For example, "going to Mars" isn't quite as simple a proposition as, say, going to Minneapolis. Here on Earth, when you ...

Mars is a cold, dry, desert-like planet. But billions of years ago, scientific evidence suggests that it had a thick ...

A NASA mission will send twin spacecraft to Mars to learn what happened to the Red Planet's ancient, thick atmosphere.

As an astronomer studying the universe beyond Earth, I’m fond of “outside the box” views almost by default. But one of my favorites is whenever a spacecraft takes a snapshot of our home world and the ...