Planets, Solar System | featured news

Astronomers have obtained an important first look at the dwarf planet Makemake - finding it has no atmosphere. One of five such dwarfs in our Solar System including former planet Pluto, Makemake had until now eluded study. But in April 2011, it passed between the Earth and a distant star, and astronomers used seven telescopes to study how the star's light was changed.

A star already known to host five alien planets may actually be home to a whopping nine full-fledged worlds - a planetary arrangement that, if confirmed, would outnumber our own solar system and set a new record for the most populated system of extrasolar planets yet found.

The Milky Way galaxy may be filled with millions upon millions of Jupiter-sized planets that have escaped their solar systems and are wandering freely in space, researchers said Wednesday in a finding that seems certain to make astronomers rethink their ideas about planetary formation.

Neptune may have polished off a super-Earth that once roamed the outer solar system and stolen its moon to boot. The brutal deed could explain mysterious heat radiating from the icy planet and the odd orbit of its moon Triton.

Astronomers have found 32 new planets outside our solar system, adding evidence to the theory that the universe has many places where life could develop....

As astronomers become more adept at hunting for, and finding, exoplanets orbiting stars beyond the Solar System, international astronomers have figured out just what we should be looking for, using the increasingly sophisticated technologies being developed.