Two decades ago, the International Astronomical Union—which defines and names celestial bodies—redefined the criteria for ...

A new solar telescope at Paranal studies the Sun to reduce stellar noise, helping scientists better detect and study ...

Rogue planets sound like rare travelers among the stars, freed from the gravitational constraints of a host system, left to ...

A rocky planet nearly 50 light-years away appears to be airless, dark, and covered in volcanic or weathered rock, according ...

The celestial body’s status as the solar system's ninth planet was withdrawn in 2006. Now some experts say we might want to ...

The findings could more than double our current database of worlds that loop around binary star systems. But researchers need ...

So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't been for lack of trying. According to a new paper by Thomas Winterhalder of ...

A possible cousin of Pluto seems to be circling the far reaches of the solar system. The dwarf planet candidate 2017 OF201 travels in a superwide orbit, with the sun relatively near one end of its ...

Stargazers can get a rare glimpse of several planets aligning this week. The event is referred to as a planetary parade, and will see several of our solar system’s residents forming a line in the ...