Mars is about 140 million miles from our cozy planet. A human mission to that cold, rocky neighbor would mean being away from Earth for about 3 years. But the things those explorers would see and ...

The Eyjafjallajokull volcano began erupting in March ... Most of it was very fine particles which formed an ash cloud, rising 6-10km (20,000-35,000 feet) into the atmosphere. Ash clouds pose great ...

Various volcanic features can be found on the rocky planets neighboring Earth. Mars contains volcanic plains formed by past eruptions and inactive shield volcanoes that are much more massive than ...