The search for Earth 2.0 has begun in earnest. But there's a huge variety of exoplanets out there, so narrowing down the search to focus valuable telescope time on only the best candidates is critical ...

If confirmed, the rock would become just the second world past Neptune in our solar system to host an atmosphere.

One is a hot Jupiter, a giant planet skimming close to its star. The other is a smaller gas-rich mini-Neptune traveling even ...

A new study suggests that a tiny, icy world beyond Pluto harbors a thin, delicate atmosphere that may have been created by ...

A giant planet was supposed to have the place to itself. Instead, in a star system 190 light-years away, a hot Jupiter shares ...

Across the Milky Way galaxy, a planetary odd couple is circling a star some 190 light years from Earth. A normally "lonely" ...

A new study suggests that a tiny, icy world beyond Pluto harbors a thin, delicate atmosphere that may have been created by ...

Even as temperatures rise on Earth's surface and in the lower atmosphere, the planet's upper atmosphere has cooled ...

In Star Wars, Anakin Skywalker burned alive on the shores of a roiling lava planet called Mustafar, fueling his tumultuous transition into Darth Vader. Now, astronomers have found an atmosphere on a ...

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