For the first time, astronomers have detected radio signals from a planet beyond our solar system, according to a study ...

A new study suggests that our solar system’s smallest planet has shrunk by up to 30 percent since its birth roughly 4.5 ...

“Its location at the edge of the solar system makes it a bit of a black hole from a knowledge point of view,” Dr. Craig ...

Astronomers found a Neptune-sized planet orbiting backwards around its star, but the usual explanation for its bizarre path is nowhere to be found.

Purple is only the latest entry in Mars’s surprisingly broad color chart.

Astronomers have confirmed a world less than a million years old as the youngest known planet, using data from archives.

The solar system's smallest planet has gotten smaller still.

Earth,” your mind probably jumps straight to a sci-fi blockbuster movie poster or a comic book alternate dimension. But astronomers just proved that huge, rocky ...