Two very different Saturn moons

One moon is small and irregular, and the other is larger and round. These two moons typify the sorts of objects you see throughout our solar system.

October 13 to November 11: Longest lunar month of 2015

Longest lunar month of 2015 starts with the October 13 new moon and ends with the November 11 new moon. Learn about the varying lengths of lunar months, here.

New images of Pluto’s moon Charon

Images released Friday, October 9. New Horizons acquired them when it swept past the Pluto system on July 14. The spacecraft's data are still being returned.

Mars Curiosity rover sends a postcard

If you want to imagine standing on the surface of the Red Planet Mars ... look at this.

Mysterious ripples race across planet-forming disk

Astronomers have found fast-moving wave-like features - ripples - in the dusty disk surrounding a young star. Nothing like this was ever observed or predicted.

Where to look for ET life? Habitability index aids in the search

Powerful telescopes coming soon. Where shall we point them to find extraterrestrial life? Astronomers have created a way to help prioritize exoplanets.

NASA orbiter views real ‘Martian’ sites

Real-life views of places on Mars where a fictional stranded astronaut, Mark Watney - from the Hollywood movie The Martian - undergoes his many trials.

See Wednesday’s rocket launch from U.S. mid-Atlantic

Time will be 7 p.m. EDT this evening. People in a wide swath of U.S. mid-Atlantic states can see it, if skies are clear.

How close to sending people to Mars?

There's now a target date of 2030 for a manned mission to Mars. But how close are we, really, to becoming Martians?

NASA shortlists 5 possible new missions

NASA has announced five investigations for further study in its latest competition for new, relatively small-scale, robotic missions into our solar system.