Billions of years ago, it rained on Mars. The water collected in valleys and rivers, filled and spilled over the rims of ...

Ask someone on Earth for the time and they can give you an exact answer, thanks to our planet's intricate timekeeping system, ...

Mars has long been framed as a cold, dry desert, but new research is revealing a planet laced with hidden ice and glacial ...

The picture-perfect launch of twin Escapade orbiters bound for Mars presages a fantastical new age in exploring the planets, ...