Our search for exoplanets is focused on Milky Way stars. It's been successful, with more than 6,000 detected so far.

A first ever detection of a coronal mass ejection from a small red dwarf could have big consequences for life on any nearby ...

A new dwarf planet named 2017 OF201 has been discovered far beyond Neptune. It sits in a region previously thought to be empty. Its existence raises questions about the structure of our solar system ...

There are no confirmed exomoons, moons orbiting distant exoplanets in other solar systems. There are a few candidates, but ...

CAPE CANAVERAL, Fla. (AP) — A scrawny dwarf planet nicknamed the Goblin has been discovered well beyond Pluto. A round, frozen world just 186 miles (300 kilometers) across, the Goblin was spotted by ...

The newly discovered 2012 VP113, in red, and Sedna, in orange, orbit far from the Sun. The four pink bands are Jupiter, Saturn, Uranus and Neptune. The blue dots are Pluto and the rest of the Kuiper ...

WASHINGTON >> Scientists have identified an object about 435 miles wide inhabiting the frigid outer reaches of our solar system that might qualify as a dwarf planet, spotting it as it travels on a ...

In 1930, scientists discovered a small celestial body on the outer edge of our solar system. They called it Pluto and classified it as a planet. However, the International Astronomical Union (IAU) — ...

Our solar system is much like a trail of microcosmic breadcrumbs: Follow the molecular bits as far back as they go, and you'll learn a thing or two about where many of our planets and other celestial ...

A possible new dwarf planet has been discovered at the edge of our solar system, so far-flung that it takes around 25,000 years to complete one orbit around the sun. The object, known as 2017 OF201, ...