Astronomers have, for the first time, pinned down both the mass and distance of a planet that drifts through the galaxy ...

Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission ...

The discovery of an extraordinary multi-planet system has demonstrated that so-called "hot Jupiter" planets may not be lonely giants after all. The findings could force scientists to revise their ...

Hubble reveals the largest planet-forming disk ever seen, Dracula's Chivito, showing a chaotic and uneven environment around ...

Every planet in the solar system leans, some gently, some dramatically, and that tilt quietly shapes everything from our ...

Gaia data reveals signs of planets forming around young stars by measuring stellar motion, identifying planetary, brown dwarf, and stellar companions in early star systems ...

An artist’s impression of the two new planets discovered. An inner super-Earth, here seen transiting in front of the orange host-star and an icy giant planet on the periphery of the system. The ...

Short-lived radioisotopes such as aluminum-26 influenced early solar system heat, water retention and the formation of Earth-like rocky planets, according to meteorite analyses and models.

CAPE CANAVERAL, Fla. (AP) — Astronomers have discovered the earliest seeds of rocky planets forming in the gas around a baby sun-like star, providing a precious peek into the dawn of our own solar ...

Two rare cosmic collisions around the young star Fomalhaut were caught by space telescopes, offering new clues about how planets form.