Astronomers may have found the Solar System's 9th planet
No, it still isn't Pluto.
Watch Pluto's mesmerizing space weather
NASA's Solar System weather simulation shows how quiet it was near Pluto when New Horizons showed up.
This is your closest look yet at a Kuiper Belt object
NASA's New Horizons probe spotted an object 3.3 billion miles away from the Sun.
Astronomers discover the most distant Solar System object to date
V774104 is thought to be 15.5 billion km from the Sun.
The Big Picture: NASA shows off Pluto's largest moon
ICYMI: Worm mind control, a creepy new Barbie and more
It's everything you forgot to save and read later, in today's ICYMI!
To scale Solar System model built across seven miles of Nevada desert
To explain the size of our Solar System, one group made a scale model in the middle of the desert.
NASA mission sends back fuzzy, color 'movies' of Pluto
Sure, Pluto doesn't have full-fledged planetary status anymore, but we're still excited to get som...
NASA thinks we'll find signs of extraterrestrial life in 20 years
The quest to find proof of life beyond Earth hasn't been without its setbacks, but NASA isn't dete...