Astronomers have discovered a large trans-Neptunian object, 2017 OF201, at the edge of the solar system. Its strange orbit challenges the Planet Nine theory and shows the space beyond Neptune is not ...

In the remote outer reaches of planetary systems, far beyond the orbit of known planets, enormous and mysterious worlds silently loop around their stars. Some drift as far as 10,000 times the ...

Astronomer and Pluto mission leader S. Alan Stern explores how the field has transformed during his decades-long career.

Venus will partner up with the giant planets Saturn and Neptune to form a line up in the pre-dawn sky on May 8, with fleet-footed Mercury remaining nearby close to With Mercury sticking low to the ...

The ice giant Neptune - too dim to spot with the naked eye - will be positioned roughly 1 degree to the upper left of Saturn and can be observed using a telescope with an aperture of 8-inches (200 ...

Astronomers discover GJ 2126 b, a giant planet with an extremely eccentric orbit, 124 light-years away, using HARPS data.

A giant exoplanet is surprisingly chill given how close it is to its red dwarf star — perhaps because the star is so little.

Uranus is still behind planets such as Jupiter, Saturn and Neptune in terms of how much heat it emits.

A planetary census conducted by the California Legacy Survey illuminates where giant planets tend to reside relative to their stars.