There may be another world lurking between the orbital lines of our solar system. Astronomers in Japan have published their theory of an “Earth-like planet,” dubbed Planet Nine, that’s hiding in plain ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. You probably learned growing up there are nine planets around the ...

Astronomers are racing to explain peculiar orbits of faraway objects at the edge of our solar system. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

Astronomers have discovered a rare solar system with six planets moving in sync with one another. Estimated to be billions of years old, the formation 100 light-years away may help unravel some ...

Astronomers have discovered a rare in-sync solar system with six planets moving like a grand cosmic orchestra, untouched by outside forces since their birth billions of years ago. The find, announced ...

After decades of exploring, NASA's Voyager 1 hit the edge of the solar system and passed through a great "wall of fire," ...

Our solar system is a smashing success. A new study suggests that from its earliest period—even before the last of its nebular gas had been consumed—Earth's solar system and its planets looked more ...

The newborn planetary system appears to be emerging 1,300 light-years away around a baby star known as HOPS-315. Planet-forming materials were first identified using NASA's James Webb Space Telescope.