What is a brown dwarf star? These formations often defy classification, blurring the line between planets and stars.

Most of the exoplanets we've discovered orbit red dwarf stars. This isn't because red dwarfs are somehow special, simply that ...

LTT 1445 Ac is roughly the size of Earth and about 22 light-years away in the constellation Eridanus. The planet orbits the ...

Photosynthesis changed Earth in powerful ways. When photosynthetic organisms appeared, it led to the Great Oxygenation Event.

Mexico, N.Y. – Malaki Sandejas, 8, loves a dwarf planet. Sitting next to his mom on their couch, he rattles off the five in our solar system. “The dwarf planets are Haumea, Makemake, Eris, Ceres and ...

For observers in India, Neptune will be visible throughout most of the night on September 21-22, rising in the east just as ...

The four largest objects in the belt are Ceres, Vesta, Pallas, and Hygiea. Ceres is the only dwarf planet in the inner solar system. Gaps in the asteroid belt, called Kirkwood gaps, correspond to ...

R esearchers looking for objects in the Kuiper Belt – the donut-shaped region beyond the orbit of Neptune containing icy ...

Starstruck Billions of years ago, our Solar System may have had an incredibly close encounter with another passing star. As ...

I’m implicated as an accessory to the demotion of Pluto,” the astrophysicist tells PEOPLE, explaining why they are upset ...

Starting Saturday, more than 200 new laws will take effect in Arizona. Here’s a breakdown of seven laws about topics from ...

T Coronae Borealis, one of the fainter stars included in the constellation Corona Borealis, is expected to go nova any day now.