It took over nine years for New Horizons to reach Pluto after blasting off atop an Atlas 5 rocket on Jan. 19, 2006. After ...

Since Pluto is so far from Earth, little was known about the dwarf planet's size or surface conditions until 2015, when NASA's New Horizons space probe made a close flyby of Pluto.

If Earth were in Pluto’s position, Soter said it would still be a planet — but only marginally — based on its neighborhood-clearing abilities.

Once the existence of Pluto's atmosphere was confirmed, scientists began to investigate how the atmosphere and the surface temperature change during Pluto's 248-Earth-year journey around the sun.

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

Pluto is, on average, 40 times farther from the sun than Earth is. That means that from Pluto the sun appears 40 x 40 = 1,600 times fainter (or, to use better math grammar, one sixteen-hundredth ...

It takes Pluto slightly over 248 Earth years to orbit the sun, which means that on March 23, 2178, one Plutonian year will have elapsed since the dwarf planet was first spotted, on Feb. 18, 1930.

What processes during the formation of Pluto's largest moon, Charon, potentially led to it having cryovolcanism, and even an ...

It was one of the most ambitious missions for NASA since the turn of the century, with photos reshaping what scientists know ...