The relative quantities of volatile gases like methane and ethane can reveal key details about distant Kuiper Belt objects.

Astronomers are ready to search for the fingerprints of life in faraway planetary atmospheres. But first, they need to know ...

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary ...

As well as planets and moons, the solar system also contains dwarf planets, which are too small to be considered planets. The best known of these is Pluto, an ice dwarf that orbits far from the ...

Hubble's survey of Andromeda focused on 36 dwarf galaxies (circled in yellow) that share Andromeda's environment. Unexpectedly, all of the galaxies appear to be arranged on a plane, orbiting in ...

The newfound alien world orbits a nearby M-dwarf star designated GJ 2126. The discovery was announced in a research paper published Feb. 16 on the arXiv pre-print server. The radial velocity (RV ...