The Kepler mission has discovered an exoplanet smaller than Mercury orbiting a Sun-like star.
Astronomers have confirmed that the star HD 140283 is nearly as old as the universe.
White dwarfs can have stable habitable zones for a few billion years, and planets with Earth-like atmospheres might be much easier to detect around these stellar remnants than normal, hydrogen-fusing stars.
Astronomers searching for forming planets have a new place to look. Even the thin disks around brown dwarfs are capable of forming grains large enough that, one day, they could potentially coalesce into a rocky planet.
A new set of simulations shows that systems with so-called "hot Jupiters" might also have mini-Oort clouds detectable by today's space telescopes, giving astronomers a new potential tool for finding exotic extrasolar systems.
Astronomers have found a system of six super-Earths, one of which is at the "Goldilocks" distance for sustaining liquid water. The Sun-like host of the system lies only 40 light-years away.
New analysis suggests that Fomalhaut b — an exoplanet discovered in 2008 and disputed ever since — really does exist.
Stunning auroras play in Earth's upper atmosphere, and similar cascading curtains grace the skies of giant planets, brown dwarfs — and even small stars.
The Dark Energy Camera is one of four new cameras that started taking images of big chunks of the night sky this past month.