There is a possible new explanation for a mysterious type of crater on the surface on Mars.  Double-layered ejecta craters (DLEs) are surrounded by debris excavated by an impactor  just…

The intensity of the jets of water ice and organic particles that shoot out from Enceladus, a moon orbiting Saturn, depends on its proximity to the ringed planet, according to data obtained by NASA's…

A color image, taken on May 1st, 2013 by the Wide Angle Camera (WAC) instrument aboard NASA's MESSENGER spacecraft orbiting Mercury, features the Hovnatanian crater, named for Armenian painter Hakop…

In this Hubble Space Telescope composite image taken in April 2013, the sun-approaching Comet ISON floats against a seemingly infinite backdrop of numerous galaxies and a handful of foreground stars…

When some galaxies stop forming new stars, they become "quenched". Quenched galaxies in the distant past appear to be much smaller than the quenched galaxies in the Universe today, which is…

Astronomers have found a new way of measuring the spin in supermassive black holes. By viewing optical, ultra-violet and soft x-rays generated by heat as the black hole fed, they were able to…

Researchers have devised a way to measure the internal properties of stars, a method that offers more accurate assessments of their orbiting planets.  The astronomers examined HD 52265, a star…

A computer model estimate says it might be easier than previously thought for a planet to overheat into the scorchingly uninhabitable "runaway greenhouse" stage. That may mean some planets…

Exoplanets - planets around stars other than the sun - were discovered almost 20 years ago,but for the first time, X-ray observations have detected an exoplanet passing in front of its parent star.…

Astronomers have long assumed a kind of cosmic equilibrium: when a galaxy produces too many stars too quickly, it greatly reduces its capacity for producing stars in the future. A group of…