Astronomers have discovered a neutron star that switches between X-ray and radio emission within a few days. The find is fabulous news for theorists, who have long predicted that the two pulsar types were connected.
Scientists sneaked a peek into the Sun’s interior, but what they saw contradicts the assumptions made by models predicting solar activity.
New studies of the coolest brown dwarfs are helping astronomers explore the mysterious objects that bridge the gap between stars and planets.
Observations of two solar twins — one old and one young — confirm that the Sun has probably destroyed the fragile element as the star has grown older.
Observing the pattern of flickers in a star’s light offers a new way for astronomers to measure one of the basic properties of stars — and any exoplanets they might host.
Astronomers have detected a signal that looks like it's from two neutron stars crashing together. The observations could be solid evidence for the hypothesized culprits of short gamma-ray bursts.
Scientists are struggling to explain the Sun’s bizarre recent behavior. Is it a fluke, or a sign of a deeper trend?
Astronomers at the American Astronomical Society's Solar Physics Division meeting discussed new evidence that magnetic waves are the reason our star's corona is blazing hot.
Space-based observations of RR Lyrae variable stars, once considered the paragon of simplicity, are revealing turmoil in their daily vibrations.
Dusty disks that encircle young stars sometimes host giant gaps. But a new study shows these gaps aren't necessarily the signature of a nearby planet.
These stellar corpses have many faces, from pulsars to magnetars. New models provide evidence for unifying these disparate objects under one theory.
Four powerful radio bursts have left astronomers scratching their heads. The bursts appear to come from several billion light-years away and could provide a whole new look at the universe — but observers aren't sure what they are.
Scientists have made the most realistic simulations yet of the violent collapse of dying massive stars in three dimensions.
A phenomenon you usually hear can now be seen in stars' rotation, and it may help untangle the mysteries of their magnetic fields.
How old are the Sun's stellar neighbors? An inventive approach suggests that the birth rate for the nearest stars has had two peaks instead of one — meaning two distinct generations are mixing in the neighborhood.
Studies of primitive stars suggest the universe has far too little of one form of lithium and far too much of another. But new work shows that the second problem might be nonexistent.
Astronomers have discovered an unexpected class of variable stars in the open cluster NGC 3766. The stars are problematic for current theories of star behavior and raise perplexing questions about why the stars are variable at all.
A new study suggests that close-in gas giants may heat up electrically like toaster coils plugged in to their host stars via the power lines of the stellar wind — explaning why the planets inflate.
Detailed observations of a young, nearby star are giving astronomers a chance to glimpse the Sun’s active youth.
In 2014 and 2016, Proxima Centauri will pass in front of two distant stars, potentially revealing details about itself and whether it hosts any planets in the process.
The sudden slowing of pulses coming from a spinning neutron star defy explanation — and might require a rethink of the universe’s most exotic denizens.
SS Cygni, one of the most-watched variable stars, lies at a distance that’s hotly disputed. The truth will determine whether we understand how these types of variables work.
Harvard College Observatory is digitizing its famed collection of more than 500,000 glass sky-survey plates and has just released the first data set.
An exceptionally powerful gamma-ray burst on April 27th wowed astronomers around the world — and its fading was tracked by an alert backyard observer.
A massive neutron star and its lightweight sidekick provide a unique space laboratory to test general relativity. So far, gravity keeps behaving as it's supposed to.