Scientists directly imaged two embryonic exoplanets 370 light-years away.
And it could teach us about the early solar system.
New research provides some clues about our solar system's most mysterious planet.
It could be something even cooler.
It's time to meet 2014 MU69.
An old theory gets a new assist from the sun.
There's still a lot to learn about the surface of Jupiter's moon
It could be the largest moon we've ever seen
Now astronomers want to know: what makes a star a star?
Here are some highlights from its journey
From the Popular Science archives.
Pebbles and planetesimals pummeled the planet's early surface
And you thought this summer was hot
The early solar system was a wild, world-destroying place.
The traveller (maybe from another star) didn't stay long and it's moving away fast
Another day, another hypothetical object on the outskirts of the solar system.
This gas giant has seen it all.
A gallery of photos, visualizations, and other pictures of outer space.
It could help us learn more about how stars and planets form
The evidence is right in front of you.
Scientists are hot on the trail of our solar system's 9th planet
New Horizons scientist Leslie Young discusses what to expect from the flyby on Tuesday, and the 28-year wait leading up to it
A glimpse into the birth of solar systems