It's time to say goodbye to one of the most storied explorers of our age: Voyager 2 has entered interstellar space.
Learn more about NASA's New Horizons mission, which performed history's first flyby of the Pluto system on July 14, 2015.
NASA is starting scientific observations of a new asteroid called Bennu today (Dec. 3), kicking the OSIRIS-REx mission into full gear.
Four months ago, people in a small Madagascar town caught sight of a fireball shooting across the early-evening sky. Its boom was so loud, the ground shook.
The history-making interstellar visitor 'Oumuamua is a relatively small and reflective object, a new study suggests.
There appears to be a cold "super-Earth" planet circling Barnard's Star, which lies just 6 light-years from the sun. Here's what you should know about the newfound planet candidate.
Astronomers have found compelling evidence of a frigid alien world about 3.2 times more massive than Earth circling Barnard's Star, a dim red dwarf that lies just 6 light-years from the sun.
Vega, historically one of the most-studied stars, is under scrutiny in modern times because it may have planets.
Scientists are one step closer to understanding why some comets have strange dust bands in their tails. The main culprit in this cosmic mystery? Our own sun.
The odd interstellar object that zoomed through the inner solar system last October might be an alien reconnaissance spacecraft, a new study suggests.
The first known interstellar visitor to the solar system, 'Oumuamua, highlights how life could also spread between the stars, and perhaps even across the galaxy, two new studies find.
A spacecraft orbiting the dwarf planet could use Pluto's moon Charon to make important orbital changes.
One month from today, Mars will welcome a new robotic resident that seeks to probe the planet's innards.
In less than 10 weeks, NASA's New Horizons spacecraft will explore the most distant target ever visited by a spacecraft. Mission team members don't know what to expect — and that's part of the fun.