NASA releases a breathtaking close-up right before New Horizons flyby
This year's missions to the outer solar system are set to shake up the planetary family tree
How skeptical should we be, and how will we find out if this mystery planet is really out there?
It's both chance and certainty. And there's something kind of beautiful about that.
A gallery of photos, visualizations, and other pictures of outer space.
Witness history in the making
Popular Science goes way back
Another day, another hypothetical object on the outskirts of the solar system.
It's the farthest object we've ever spotted in our neighborhood.
Scientists are hot on the trail of our solar system's 9th planet
And he thinks the upcoming flyby will prove it
Is there a planet—or even planets—waiting to be discovered out there?
The survey also confirmed the existence of two other moons, whose discovery was announced last year
The upper atmosphere of Venus is surprisingly similar Earth.
Sometimes you just need a rocket that flies at 2 million miles per hour
New Horizons scientist Leslie Young discusses what to expect from the flyby on Tuesday, and the 28-year wait leading up to it
Can you feel the love?
MU69 is far from your run-of-the-mill solar system object.
A total eclipse of the heart
This summer, the mission may get funding to travel to a mysterious rock at the edge of the solar system
More exciting news about cold, dead rocks
Something's got the Kuiper belt's rocks off, and there's a scramble to find it.
Raise the e-sail