Observations of two cool white dwarfs show irregular outbursts in the stars’ otherwise steady rhythm of pulsations.
A new technique that relies on identifying stellar twins yields a novel way to measure the distances to stars.
A collaboration of amateur and professional astronomers has uncovered a rare variety of eclipsing binary star - and a supernova in the making.
Recent radio observations support the idea that brown dwarfs form like full-fledged stars do.
The famous supernova continues to transform: its necklace of hotspots is fading away as the shock wave moves further out.
Astronomers have detected what looks like auroral emission on an ultra-cool star.
Two binary systems and a fifth stellar wheel make for a rare, and so far unique, set of stars.
Astronomers have discovered an exploding star that belongs to the "superluminous" class, and it's the most luminous one ever found.
Astronomers are looking forward to 2018, when a young pulsar will pass through its binary star companion’s disk.
Super-sharp imaging confirms that the nearby red giant star L2 Puppis is forming a tiny bipolar nebula as it comes to the end of its life.
Amateur observers helped reveal a rare eclipse of a close stellar pair known as b Persei by a third companion star.
Two new studies confirm that the white dwarfs that explode as Type Ia supernovae can approach death in two different ways.
With the initial release of the USNO's Robotic Astrometric Catalog (URAT1), astronomers now have precise positions for about 228 million stars in the northern sky. Given my love of stone walls, I've been thinking about building one in the backyard to enclose the flower beds. But I haven't had the gumption to actually buy the…
NASA’s NuSTAR mission has detected an unexpected haze of high-energy X-rays in our galaxy’s center, perhaps the signal of a mass stellar graveyard.
New evidence suggests that nanoflares, small but potent bursts of energy, might heat the Sun’s atmosphere. But not everybody’s convinced.
A 6th-magnitude nova erupted inside the Sagittarius Teapot and reached 4th magnitude. Now it has started fading.
A team of astronomers compared two images taken 18 years apart to catch the dramatic evolution of a forming star and its surroundings.
Astronomers have found two just-born star clusters an incredible 16,000 light-years above the plane of the Milky Way galaxy.
Astronomers have taken a behind-the-scenes look at a set of dense gas clumps, catching a quadruple star system in the fleeting act of formation.
Thanks to the help of the general public, astronomers have discovered a new signature marking a hidden phase of star formation.
When the massive, unstable southern star Eta Carinae sent a blast of X-rays into space last July, astronomers around the world were waiting and watching.
The Hubble Space Telescope is commemorating its 25th anniversary with a second look at the Pillars of Creation — but there’s hard science behind these pretty pictures.
Astronomers have expanded their ability to date stars using the stars’ own spins.
New IRIS results show a Sun rife with twisting and snapping magnetic fields, data that will elicit clues on what bakes the puzzlingly hot corona.
Two new studies suggest that ultraluminous X-ray sources are not all created by beefy black holes.