Mercury doesn't give up its secrets easily. The smallest planet in our solar system is also one of the most extreme—a sun-scorched, metal-rich world with a puzzling magnetic field and lavas unlike ...

A bizarre planetary pairing 190 light-years away is challenging everything astronomers thought they knew about how worlds ...

A strange 200 million-year-old object with the mass of a planet has been discovered 20 light-years from Earth, outside our solar system. The "rogue," as it's referred to by researchers, is producing ...

Astronomers have made an unexpected discovery about the planet TOI-3884b, which orbits its star at a crazy angle. The planet’s orbit is tilted by around 62 degrees compared to the star’s rotation, and ...

Hot Jupiters rank among the strangest planets astronomers have ever found. They are gas giants as massive as Jupiter, yet they race around their stars in just a few days. Since the first such world ...

Venus is often called Earth's evil twin due to its size, mass, material composition, and density. It even feels like Venus should've become a second Earth. However, it ended up being one of the ...

For a few months in 2018, as NASA's Dawn spacecraft used up its last drops of fuel, it gave scientists an incredibly detailed look at one of the strangest places in the solar system: Occator Crater.

Even at a glance, the planets in our solar system are wildly diverse. Huge and small, airless and densely packed with ...