The possibility that an additional planet may be hidden far into the solar system was touted more than a century ago. In 1983 ...

Researchers have found a candidate for the hypothetical Planet Nine, which could be an undiscovered giant planet way out in ...

NASA scientists have sought to understand planet Jupiter, the gas giant whose mass is more than the rest of the planets in ...

ESA's Solar Orbiter captured a "tube of cooler atmospheric gases snaking its way through the Sun’s magnetic field," according ...

A newly released image of the sun captured by the world's largest solar telescope shows the surface of our nearest star in ...

CAPE CANAVERAL, Fla. (AP) — A Soviet-era spacecraft meant to land on Venus in the 1970s is expected to soon plunge ...

McClain, an Army colonel and helicopter pilot, should have taken part in the first all-female spacewalk in 2019, but there ...

The mission team knows Lunar Trailblazer's precise position thanks to ground-based tracking, NASA officials said the update.

Astronomers have detected a promising sign of a ninth planet lurking at the the farthest reaches of the Solar System.

Many Southern Hemisphere observers consider this shower to be the best meteor shower of the year, but it's a different story ...

Currently, the station’s average altitude is 418.74 km, with 417.86 at the lowest point, and 438.05 km at the apogee ...