The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's responsible for the orbits of the planets and their satellites, but there ...

Could humans survive on other planets? What would it take to live on Mars, Venus, or even a moon like Titan? From low gravity to toxic atmospheres, every planet presents a unique challenge. Watch as ...

To get somewhere in outer space, you can’t exactly drive in a straight line. Orbits are tricky things, and sending a probe to ...

Cosmic forensic experts are reconstructing the magnetic field around an infant star from the planet-forming disk of gas and dust around it.

Astronomers may have found a star racing through our galaxy at an incredible speed—dragging a planet along with it! If ...

Simpson and Chen ran mathematical models looking at how differently sized Earth-like worlds would have affected the rest of our Solar System. The planet sizes tested were 1 percent of Earth's mass, ...

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's responsible for the orbits of the planets and their satellites ...