"Ask a Spaceman" is live for the first time on Facebook — and astrophysicist Paul Sutter jumps right into it with a trip to Pluto.
Learn more about NASA's New Horizons mission, which performed history's first flyby of the Pluto system on July 14, 2015.
Water and liquid rubies may exist within the nightside clouds of distant Jupiter-like exoplanets, but they melt in the heat of the planets' scorchingly hot bright sides, according to NASA.
There's a vast "hydrogen wall" at the edge of our solar system, and NASA scientists think their New Horizons spacecraft can see it.
Learn all about NASA's Parker Solar Probe mission, which the agency aims to launch in July 2018. The spacecraft will get seven times closer to the sun than any probe ever has before.
Callisto is thought to be a long dead world, with hardly any geologic activity on its surface. But an ocean may lie underground.
If you regard comets as big old dirty snowballs, boringly uniform and featureless, this photo will set you straight.
Nearly a half century after astronauts first visited the moon, it is once again a flash point for debates on how to safely, responsibly explore the solar system.
The handlers of NASA's New Horizons spacecraft are gearing up for one last shadow-chasing adventure.
Early this morning, Mars made its closest approach to Earth since 2003 — but if you missed it, the Red Planet is still a magnificent sight to see in the sky.
Ancient and rare blue crystals from the dawn of the solar system help confirm that the newborn sun was violently active, a new study reports.
Mars will make its closest approach to Earth in 15 years early tomorrow morning (July 31), and you can follow the historic encounter live online.
NASA's newest space telescope, an instrument designed to search for relatively nearby alien planets, began gathering science data on Wednesday (July 25).
Step outside around 9:30 p.m. local daylight time on Tuesday evening (July 24), and in a single glance, you'll be able to partake in a "parade" of bright planets.
The mysterious surface of Saturn's huge moon Titan comes into gloriously sharp focus in newly released photos captured by NASA's Cassini spacecraft.