Astronomers have spotted water plumes on dwarf planet Ceres

We've observed water on Ceres. The largest object in the asteroid belt, you may remember Ceres as the round, rock-ice body that was considered for reclassification as a planet in the midst of Pluto's demotion. Astronomers observed the water in the form of vapor plumes, possibly issuing from volcano-like geysers on the… » 1/22/14 6:00pm 1/22/14 6:00pm

Leonard Nimoy is here to tell you about NASA's Ion-Thrusting Dawn…

With all the excitement over NASA's recent success (and plans for future missions) on Mars, people sometimes overlook the Agency's other deep space missions. And there are many. One of our favorites of these lesser-known (but still remarkable) missions is Dawn. » 1/07/13 1:34pm 1/07/13 1:34pm

Could giant asteroid Vesta actually be a planet?

For years, scientists have been calling Vesta an asteroid. Granted, it's a big asteroid — at 330 miles across, it's the second biggest in the solar system — but NASA's Dawn spacecraft recently got its closest look at Vesta yet, and according to Dawn's principle investigator Christopher Russel, astronomers have been… » 3/23/12 1:15pm 3/23/12 1:15pm

The solar system's second tallest mountain is hidden away on the weird…

The tallest peak in the solar system is Olympus Mons of Mars, three times taller than Mount Everest. But it's not as easy to say what the second tallest mountain is...but it might be found in the unlikeliest of places. » 10/05/11 7:40am 10/05/11 7:40am