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

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

A pair of giant planets circling a star more than 1,100 light-years from Earth looks almost too bloated to be real. Each ...

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

Astronomers have uncovered a pair of giant planets that are lighter than cotton candy. The two so-called super-puffs are the ...

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

A bizarre planet defies cosmic norms: scientists have confirmed a giant planet orbiting in reverse around one star in a close binary system—an arrangement previously thought impossible. Using advanced ...

An international collaboration has discovered two of the lowest-density giant planets ever detected: rare ‘super-puff’ ...

Astronomers have long been puzzled by a cosmic mystery: planets orbiting two stars—like Star Wars’ Tatooine—are surprisingly rare, even though they should be common. New research suggests the culprit ...

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 ...

In theory, it could happen – one of the very first solutions to the three-body problem was this scenario. But it is very unlikely to be stable over time. You need the stars to have near equal mass and ...