An international team of researchers has just revealed the existence of three Earth-sized planets in the binary stellar ...

DALLASDALLAS — A thick atmosphere has been detected around a planet that’s twice as big as Earth in a nearby solar system, researchers reported Wednesday. The so-called super Earth — known as 55 ...

As elementary schoolers, we learned the order of the planets. Maybe your teacher even had a snappy mnemonic like “My Very Educated Mother Just Served Us Nine Pizzas” or “My Very Educated Mother Just ...

Mars could have lost its liquid water, the key ingredient of life, because it is small, according to a study. Washington University researchers say that the Red Planet's size may be the key reason it ...

This illustration provided by NASA in 2017 depicts the planet 55 Cancri e, right, orbiting its star. A thick atmosphere has been detected around the planet thats twice as big as Earth in a solar ...