The star T CrB flares up every 80 years. A document from 1217 could help confirm its regularity.
A faint "bridge" of gas connects two colliding galaxies in a new photo from the Hubble Space Telescope.
Supermassive black holes are even more fearsome eaters than scientists suspected, thanks to a "delivery system" that could help them feed over months rather than hundreds of years.
A study of the Squid Galaxy, Messier 77, has revealed how chemicals swirl around its central black hole, revealing supermassive black holes impact the chemical evolution of their galaxies.
NASA has highlighted a new set of vibrant cosmic images, each one painted by the observatories that help us see what our eyes cannot.
The Royal Observatory of Greenwich's annual contest draws more than 4,000 submissions, and the winning images from this year's categories are stunning.
Two previously discovered galaxies have been hiding strange perpendicular rings of stars and gas. These so-called polar ring galaxies may prove to be less rare in the universe than once thought.
Astronomers normally observe galaxies by observing light these objects emit, but some tricky galaxies require a different approach.
A new photo from the Hubble Space Telescope captures a glittering globular cluster deep in our Milky Way galaxy.
Look to the east in the evenings throughout September to find the Great Square of Pegasus, a group of four stars of roughly equal brightness, as it climbs higher in the night sky.
An immense bubble of galaxies, one billion light years wide and located 820 million light-years away, could be fossilized remains of the Big Bang.
The magnetic field is a thousand times weaker than Earth’s, but is spread out across 16,000 light years.
Finding more debris from stellar explosions will tell us about how heavy elements are distributed across the galaxy.
The Hubble Space Telescope's Wide Field Camera 3 photographed a massive protostar lurking behind star-forming clouds of dust and gas in the constellation Ara.
A dead star feeding on a stellar companion seems to have two brightness modes. It's because, astronomers discovered, the system launches cosmic cannonballs.
A brown dwarf just 18.5 light-years from Earth has been found to host a radiation belt. But why are scientists are so excited about this?
The discovery represents the first evidence that low-mass T.Tauri stars, which are less than 10 million years old, can emit gamma radiation.
A distant galaxy sparkles from the soft glow of its many tiny stars in a new photo from the Hubble Space Telescope.