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

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

A planet-size object that possibly once visited the solar system may have permanently changed our cosmic neighborhood by warping the orbits of the four outer planets, a new study suggests. The ...

Though the planets are always “aligned,” seeing more than four in the sky is more uncommon. February’s lineup is a chance to ...

Mercury joins the night sky to complete a 7-planet alignment just after sunset for the end of February. Saturn leaves our ...

You'll be able to easily see four planets in the February evening sky, and with any luck you'll be able to raise that number to five during the final week of the month. You'll be able to easily ...

Scientists found an intriguing world in our galaxy.

Astronomers who identified HD 20794 d say its proximity to its host star and orbital pattern suggest it could hold water.

ANDES stands for ArmazoNes high Dispersion Echelle Spectrograph. AndES is a high-resolution instrument that can search for ...

When NASA launched a spacecraft to an asteroid, scientists patiently waited for their chance to look at bits of the space ...