Gas might keep the dwarf planet's subsurface ocean from freezing.
We're under a time crunch.
But we won't know until we get there.
It has to do with a surprisingly hazy atmosphere.
The heavy heart may have tipped the world over
This summer, the mission may get funding to travel to a mysterious rock at the edge of the solar system
Could icy slush be driving the dwarf planet's geological activity?
Erupting slush instead of lava
Space sailors' delight?
The dwarf planet may have a hydrological cycle, but it's not like ours
The latest and greatest images from the New Horizons mission
The New Horizons flyby is over, but now the real fun begins
Stranger worlds to come
Can you feel the love?
Popular Science goes way back
Fasten your seatbelts
New Horizons spacecraft reveals the dwarf planet is slightly larger, has polar ice cap, and more
After nine years and three billion miles, here's what we're learning from it all
Witness history in the making
New Horizons scientist Leslie Young discusses what to expect from the flyby on Tuesday, and the 28-year wait leading up to it
Just 3.5 million miles to go!
And he thinks the upcoming flyby will prove it
This year's missions to the outer solar system are set to shake up the planetary family tree
The Dawn spacecraft arrives at Ceres this March, and it could be the most surprising space mission in decades