A new discovery made using the James Webb Space Telescope (JWST) may be the weirdest exoplanet yet. The planet, designated ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Is there an unseen planet — a "planet X" or "Planet Nine" — ...

The University of Arizona’s Magellan Adaptive Optics Xtreme instrument, combined with a six-and-a-half meter ground-based telescope, has imaged protoplanets in sharp detail. By capturing images of the ...

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 ...

Clyde Tombaugh discovered Pluto in 1930; however, in 2006, the International Astronomical Union (IAU) reclassified it as a dwarf planet, a decision sparking debate among astronomers and planetary ...

Humans are considering the feasibility of terraforming our nearby planetary neighbor, so what if a distant alien civilization already had that idea and acted on it? A new paper suggests that looking ...