Santa won’t need Rudolph this year.

The Dawn spacecraft reveals their true nature

The five earlier mass extinctions seem slow by today’s standards.

Mining: It’s Not Just for Earth Anymore

Scientists used to believe that comets bring water to the moon’s polar craters, but a new model shows that lunar water is much more widespread than previously thought.

Scientists are predicting that the largest asteroid to approach Earth will fly by on Halloween night.

A spacecraft with lofty sightseeing ambitions but low on fuel may be able to latch onto passing celestial bodies and use them to swing from comet to asteroid.