Scientists directly imaged two embryonic exoplanets 370 light-years away.
New research provides some clues about our solar system's most mysterious planet.
It could be something even cooler.
We're under a time crunch.
Countdown: 45 years left until 'First Contact'
From the Popular Science archives.
Shower your friends with meteor facts.
Scientists recreated ice planets' diamond rain.
Another day, another hypothetical object on the outskirts of the solar system.
Rise Of The Rocket Girls gives the untold story of the women behind the space race
The evidence is right in front of you.
This year's missions to the outer solar system are set to shake up the planetary family tree
Is there a planet—or even planets—waiting to be discovered out there?
It could be the largest moon we've ever seen
It's surprisingly lacking in heavy elements
A good week for space photography
Scientists are hot on the trail of our solar system's 9th planet
A 'Forbidden planet' defies odds and thrives under inhospitable conditions.
New Horizons scientist Leslie Young discusses what to expect from the flyby on Tuesday, and the 28-year wait leading up to it
Popular Science goes way back
And he thinks the upcoming flyby will prove it
Even in space, bureaucracy exists.
More exciting news about cold, dead rocks
But the cold would kill you before the smell did.