The Sun, now halfway through its life, might be slowing its magnetic activity, which could lead to permanent changes in the sunspots and auroras we see.
An object previously identified as a free-floating, large Jupiter analog turns out to be two objects — each with the mass of a few Jupiters. This system is the lowest-mass binary we’ve ever discovered.
A new study of a nearby cluster of newly formed stars reveals that brown dwarfs may rival stars in the Milky Way in number, with one brown dwarf for every two bona fide stars.
At what point does a clump of gas ignite, turning into a star? Astronomers now have an answer to what makes a star — and what makes a brown dwarf.
A new study of data archived from the Galaxy Evolution Explorer (GALEX) spacecraft is revealing just how hard life might be on planets like those in the TRAPPIST-1 system.
New ideas have emerged to explain Tabby's Star, officially known as KIC 8462852, but the jury's still out on the cause of the star's weird behavior.
Ground- and space-based observations have now shed intriguing new light on a mysterious radio source more than 3 billion light-years away.
Astronomers may have watched a star collapse directly into a black hole — minus the supernova. The failed supernova could help understand how stars die.
Two recent studies suggest that brown dwarfs, or so-called “failed stars,” are nevertheless more like stars than planets.
Tabby's star, otherwise known as the most mysterious star in the galaxy, is dipping drastically in brightness, giving astronomers an opportunity to figure out what has been causing this star's weird behavior.
Stellar fireworks are what remains of a centuries-old explosion, the concussive consequence of four stars that came together in a gravitational tussle.
Astronomers have found newborn stars in gas pouring out of a galactic nucleus.
The discovery of a runaway star in Hubble's image of the Orion Nebula suggests a stellar tussle ejected three stars 540 years ago.
The star with seven exoplanets puts out enough high-energy radiation to tear away the inner planets’ atmospheres in a few billion years.
The first naked-eye supernova since the invention of the telescope lit up the global astronomy world on the morning of February 23, 1987, as news spread by phone and teletype. Supernova 1987A in the Large Magellanic Cloud eventually reached magnitude 2.9, before beginning a long fade and a cascade of unexpected developments that continues to…
New images of two pulsars show beautiful, complex clouds of charged particles that illustrate the power dynamics in and around these spinning neutron stars.
Astronomers don’t understand how the galaxy’s most massive stars form, but a new simulation sheds light on the process of stellar birth.
Astronomers suspect the Sun’s closest stellar neighbor desiccated its potentially rocky exoplanet, destroying the planet’s chances for habitability.
Astronomers suspect that a binary star system in Cygnus is preparing to make one star of two, erupting in a red nova visible to the naked eye.
For the first time, a team of astronomers has placed a fast radio burst on the cosmic map, allowing them to better pinpoint its mysterious origin.
From the discovery of gravitational waves to the building evidence that a massive planet could exist beyond Pluto, it has been a thrilling year for astronomy research. We recap.
The red supergiant marking Orion's shoulder seems to be spinning too fast. Did it get a boost when merged with a smaller companion star 100,000 years ago?
An incredible blaze of light discovered more than a year ago still has astronomers baffled as to its cause - and the answer may be contrary to recent headlines.
Asteroseismologists delving into the Kepler mission's data trove have found a star that appears to be more spherical than any natural object.
Astronomers have imaged a third star embedded in the spiral disk around a pair of baby stars, the first direct evidence of a process of star formation known as disk fragmentation.