When 1I/'Oumuamua was first spotted in 2017, astronomers quickly determined that it came from outside the solar system. But ...

The solar system lost its ninth planet back when Pluto was demoted to a dwarf planet, but research might indicate that there ...

Iconic NASA Probe That Visited Pluto Could Go Dark Thanks to Trump Cuts If it weren't for the new budget, New Horizons could keep exploring the outer reaches of the solar system into the 2030s.

Pluto, once thought to be a frozen and lifeless world drifting on the edge of our solar system, may be harboring one of its ...

The best window to see Pluto all year is closing A once-a-year alignment makes the dwarf planet easier to spot—if you know where to look.

Over the past decade, researchers have been puzzling through Pluto’s mysteries. Meanwhile, the New Horizons probe heads for interstellar space.

Three billion miles and nearly ten years of travel led up to the moment NASA's New Horizons probe zoomed past Pluto today, collecting information to send back to Earth.