New Horizons spacecraft

Distant Pluto Comes To Life

When a probe skimmed past the dwarf planet in July, researchers expected to see a cold, dead world. New results published today show that Pluto is an active place.

Why Is The Sky Blue? (On Pluto, That Is)

Pluto's atmosphere has a blue haze, in a new photo from the New Horizons probe. But the particles causing that color are probably gray or red — and the planet's surface has red ice.