Astronomers once thought asteroids were boring, wayward space rocks that simply orbit around the Sun. But recent observations show that asteroids are anything...
A series of images taken by the NASA/ESA Hubble Space Telescope documents the formation of a Great Dark Spot on Neptune for the first time.
This is a composite...
The NASA/ESA Hubble Space Telescope has captured the brilliance of an open star cluster called Messier 11 (also known as M11 or NGC 6705).
This image of...
The NASA/ESA Hubble Space Telescope has produced this beautiful image of an elliptical galaxy called Messier 49.
This Hubble image shows the elliptical...
Hypervelocity stars are solitary stars moving fast enough to escape the gravitational grasp of the Milky Way Galaxy. Discovered in 2014, LAMOST-HVS1 is...
Globular clusters are densely packed, spherical collections of hundreds of thousands or even millions of stars. They are among the oldest known objects...
Observations by ESA’s Mars Express orbiter show evidence of an ancient planet-wide groundwater system on the Red Planet.
Mosaic of the Valles Marineris...
A stunning new image from the NASA/ESA Hubble Space Telescope captures an ongoing cosmic collision between two disk galaxies.
This Hubble image shows two...
Mars today is a cold, dry world, but it may not always have been so. Recent studies increasingly indicate that the planet once had a thicker, denser atmosphere...
Astronomers using the NASA/ESA Hubble Space Telescope have observed the massive, luminous globular cluster NGC 2419, also known as the ‘Intergalactic...
A new study led by SETI Institute astronomers suggests that the recently-discovered moon of Neptune, Hippocamp, is probably an ancient fragment of a much...
Astronomers using ESA’s Gaia satellite have discovered a large stellar stream that is currently traversing the immediate solar neighborhood at a distance...
Since its launch into orbit in 1990, the NASA/ESA Hubble Space Telescope has helped astronomers to amass an album of outer planet images. Yearly monitoring...
Astronomers using the NASA/ESA Hubble Space Telescope have discovered a new dwarf galaxy in our cosmic neighborhood. Named Bedin 1, the galaxy is approximately...
Astronomers using data from NASA’s Chandra X-ray Observatory and ESA’s XMM-Newton spacecraft have found evidence that an invisible force called dark...
