SUNSET: 
Asteroid Ceres Was Radioactive — and That Could Explain a Lot
Radioactive heating in this asteroid's early days may have destabilized the small world, creating asymmetric surface features.
A Black Hole Lurks in a Galaxy Near Our Own
Astronomers have found a dormant black hole orbiting a massive blue star in the Large Magellanic Cloud, a satellite galaxy of the Milky Way.
Have We Found the First Rogue Black Hole in the Milky Way?
Hubble observations have revealed a stellar-mass compact object — a black hole or possibly a neutron star — wandering our galaxy.
Mystery of the Sun's Chemical Makeup Lingers
Astronomers think they might have a solution to the conundrum of the Sun's chemical composition.
Icy Moon Europa May Host Water Near the Surface
Radar measurements of ice on Earth suggest that Jupiter's moon Europa might host water near its surface.
Summer on Neptune is Surprisingly Chilly
Even though Neptune is entering its version of summer, it's actually cooling down — except for its poles, which are mysteriously warming up.
These Two Black Hole Behemoths Will Merge in 10,000 Years
Astronomers have discovered a pair of supermassive black holes that whirl around each other every two years.
Astronomers Watch the Making of a Super-Earth
Gaseous mini-Neptunes may become rocky super-Earths when they lose their atmospheres. Now, astronomers have caught that process in action.
