Not all planets are lucky enough to live in a neighborhood like our Solar System – some are doomed to roam the cosmos alone.

Astronomers believe the free-floating planet is around 22 percent the mass of Jupiter and lies 3,000 parsecs from the Milky ...

Astronomers have identified a giant planet circling a tiny red dwarf star at a distance so extreme that it sits about 690 ...

Distances in space are usually impossibly large and hard to get a handle on but this week astronomers said as many as six percent of stars known as Red Dwarfs have planets around them in the habitable ...

Planetary size was determined pre-spacecraft by measuring the planet's angular diameter and its distance from Earth (in AU, later converted to terrestrial units after the AU was accurately measured ...

Planetary alignment, or conjunction, refers to the apparent close grouping of planets in the night sky as viewed from Earth, not necessarily a perfect linear alignment in space. These alignments occur ...

In 2025, astronomers sharpened their view of the planetary system around Proxima Centauri — the sun's closest stellar ...