Featured in Pluto
Frigid Pluto may have had a toasty start
Cracks on the dwarf planet’s icy surface suggest it was warm enough to host a liquid ocean early in its history.
Did Uranus get smacked so hard it spun sideways?
The traumatic event may also have seeded the gas giant’s many moons.
This spherical asteroid might be our solar system’s tiniest dwarf planet
It could join the ranks of Pluto and four others in our celestial neighborhood.
How Pluto keeps its secret ocean warm
Gas might keep the dwarf planet’s subsurface ocean from freezing.
The outer solar system awaits—but getting there may not be as easy as we’d like
We're under a time crunch.
Why is Pluto no longer a planet?
Short answer: Because we changed the definition of the word “planet” to better fit its meaning.
Neptune, Titan, Jupiter, and Pluto look gorgeous in these new photos
A good week for space photography
Pluto may be made up of a billion comets
But we won't know until we get there.
The mysterious object NASA is visiting in 2019 might have its very own moon
New Horizons will soon find out what's up with MU69.
The most incredible pictures of every planet in our solar system
Each and every planet—and one dwarf planet—in our solar system, represented with the single best image ever taken of it. Say hello to our neighbors.