Two new studies suggest that ultraluminous X-ray sources are not all created by beefy black holes.
Astronomers might have an explanation for why some classical novae erupt in gamma rays.
A new measurement, made using radio interferometry, argues that the distance to the Pleiades star cluster measured by ESA's Hipparcos satellite really is wrong — and that ground-based astronomers had it right all along.
Astronomers might have found a star that was infected by the explosive death of one of the universe’s first stars.
Astronomers might be on the brink of developing a new rung on the cosmic distance ladder.
Astronomers have detected a star in pre-explosion images of the peculiar supernova 2012Z. The detection is the first discovery of a potential progenitor for the oddball class of stellar explosions dubbed Type Iax.
Astronomers have detected gamma-ray emission from three classical novae, an unexpected discovery that has left them perplexed.
NASA's Fermi Space Telescope recently spotted a pulsar in a rare transitional phase as it devours the matter of its companion star.
Scientists have confirmed that the soft X-ray glow permeating the sky has two sources: one inside the solar system, one outside.
A newly discovered radio burst places these ultrafast, ultrabright pulses on the cosmic map of unknown phenomena.
Astronomers have discovered two stars that lie more than 700,000 light-years from Earth, making them the most distant stellar members of our galaxy ever detected. Blogger John Bochanski tells the story of how his team found these faraway stars.
Since Thorne-Żytkow Objects were proposed forty years ago, no one has actually seen one of these exotic stellar hybrids – until now.
A new study finds every stage of star formation in a single cloud, firmly backing a popular star-formation recipe.
Two elements deep within Cassiopeia A, hint the supernova remnant underwent a quark nova — a theoretical second explosion that leaves behind a quark star — just days after the original supernova.
Astronomers have confirmed that a star in the constellation Hercules is a dead ringer for one of the Sun’s long-lost brothers.
Infrared observations have uncovered a cool brown dwarf that’s only about 7 light-years away. The object is one of the closest stellar systems to the Sun and the coolest brown dwarf yet discovered.
In 2010, a mysteriously bright supernova appeared, later sparking a debate within the astronomy community. But new images of the now-faded supernova reveal an intervening — and until now invisible — cosmic lens, which magnified its light.
The odd behavior of a star in the heart of the Stingray Nebula provides tantalizing evidence that we may be seeing, first-hand, its helium-shell flash: an explosive phase of nuclear burning at the end of a star’s life.
Take a look at this supernova remnant from radio waves to x-rays to see multiple features of its bubble-like expanding shock wave. Supernovae — the dramatic explosions of massive stars ending their lives — can outshine their host galaxies for weeks, allowing them to be seen across millions of light-years of empty space. On...
Asteroid debris might be bombarding a radio pulsar in the constellation Puppis.
A team of astronomers has assembled the first fully three-dimensional view of stellar motions in a nearby galaxy.
A radioactive element produced near the heart of collapsing stars hints at the mechanism behind Cassiopeia A’s supernova explosion.
Astronomers have discovered the purest star to date. Composed almost exclusively of hydrogen and helium — with 15 million times less iron than our Sun — it illuminates what happened among the first supernovae in the early universe.
Astronomers have discovered a new “failed star” with unusually red, dusty skies. The dust makes the object look much younger than it actually is, complicating studies of this type of brown dwarf.
Astronomers have found a size gap between stars that fuse hydrogen in their cores and so-called failed stars, which never muster the ability to sustain fusion. This boundary could help observers precisely identify the smallest stellar citizens.