At the right point of the orbit and stellar cycle, the star’s chromosphere brightens.

A planet roughly the size of Neptune has stunned astronomers by orbiting its star in the opposite direction of the star’s ...

Although both worlds are nearly as large as Jupiter, they contain far less material packed into their enormous volumes.

A groundbreaking super-puff planet discovery has revealed two giant exoplanets with densities below cotton candy, changing ...

Add Yahoo as a preferred source to see more of our stories on Google. University of North Carolina researchers have recently discovered a baby exoplanet that could challenge our current understanding ...

What is Planet Nine, and where is it? The question has fascinated astronomers for years. Scientists believe a massive undiscovered planet may exist in the outer Solar System. Although no telescope has ...

"This discovery provides a crucial insight into how planets form even around massive, eccentric objects." ...

Astronomers have discovered a pair of giant planets that are lighter than cotton candy – "super-puffs" the size of Jupiter.

The International Astronomical Union defines a planet as a celestial body that orbits the sun, is massive enough that gravity has forced it into a spherical shape, and has cleared away other objects ...

Brown dwarf exoplanet system TOI-201 c is the longest-period transiting object ever confirmed by radial velocity, and the ...

The hunt for Planet Nine continues as new discoveries make the Solar System’s biggest mystery even harder to solve. Is there ...