SUNSET: 
The Planet K2-18b May Not Be Habitable After All
New research suggests Exoplanet K2-18b may actually be a gas-rich planet with no habitable surface instead of a habitable water world.
Fast Radio Burst Roundup
They’re powerful, they’re fast, and we aren’t sure about what causes them, but astronomers are closer than ever to understanding the source of mysterious fast radio bursts.
The Life and Times of Immortal Stars
Under the right conditions, stars could become immortal. How is this possible, and what does it mean for these stars’ surroundings?
Protostar Companions in Orion
How are stars born? One of the best places to test ideas about stellar birth is in Orion.
How to Warn of Imminent Neutron Star Collisions
What if gravitational-wave observatories could send out alerts right after — or even before — receiving signals of neutron star collisions?
The Eventual Fate of Our Solar System
Have you ever wondered about the future of our solar system? Astronomers have predicted the effect of the Sun's expansion on its planets.
Casting Doubt on a Nearby Black Hole
New research has shown that the recently-discovered closest black hole to Earth might not be a black hole after all but a binary star.
An “Impossible” White Dwarf Identified in Kepler Data
Meet the white dwarf that defies all expectations.
A Link Between Fast Radio Bursts, Magnetars, and Supernovae?
What causes the bizarre, extragalactic fast radio bursts we’ve detected over the last decade? An unusually bright supernova may hold the answer.
Hubble Confirms Interstellar Buckyballs
From a jumble of confusing clues in Hubble observations of interstellar space, scientists have picked out evidence of a celebrity molecule: ionized Buckminsterfullerene, or buckyballs.
Inflating a Super-Puff Planet
Super-puffy exoplanets are a problem. They shouldn’t exist — and yet we've detected half a dozen of them. Here's what theory might be getting wrong.
Dwarf Galaxy or Giant Globular Cluster?
AAS Nova brings us the story of a newly discovered cluster of stars. But the jury's out as to whether this group is a typical ancient stellar cluster or something more.
Taking Note of Molecules in Space
What do methylidyne, cyanamide, vinyl alcohol, and rugbyballene all have in common? They’re all molecules that have been detected in space — and they’re all included in a recent census of our universe’s chemical makeup.
Surprise Discovery of a 14-Year-Old Supernova
Much of today’s astronomy happens via methodical searches, but sometimes serendipitous discoveries still surprise us. Such is the case with the transient CGS2004A, a possible supernova recently detected in a galaxy nearly 50 million light-years away.
The Fate of Exomoons when Planets Scatter
Planet interactions are thought to be common as solar systems are first forming and settling down. A new study suggests that these close encounters could have a significant impact on the moons of giant exoplanets — and they may generate a large population of free-floating exomoons.
Neutron Stars Discovered on Collision Course
Got any plans in 46 million years? If not, you should keep an eye out for PSR J1946+2052 around that time — this upcoming merger of two neutron stars promises to be an exciting show!
An Eccentric Planet Skims a Giant Star
As part of a major survey of evolved stars, scientists have discovered the most eccentric planet known to orbit a giant. What can we learn from this unusual object before it’s eventually consumed by its host?
More Planets in the Hyades Cluster
A few weeks ago, Astrobites reported on a Neptune-sized planet discovered orbiting a star in the Hyades cluster. A separate study submitted at the same time, however, reveals that there may be even more planets lurking in this system.
Analog of the Milky Way and the Magellanic Clouds
A hunt for merging dwarf galaxies has yielded an intriguing result: 180 million light-years away, a galaxy very similar to the Milky Way — with two dwarf-galaxy satellites just like our own Magellanic clouds
Little Eyes on Large Solar Motions
What can we learn from observations made with digital cameras mounted on ~10-cm telescopes? It turns out, a lot about the solar corona.
