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Astronomers have traced a bright, curling radio source nicknamed the "Treble Clef" to a massive galaxy cluster hidden behind the plane of the Milky Way, and identified the source itself as a radio…
Astronomers have identified the gamma-ray pulsar PSR J0435+3233 as a member of a three-star system and worked out both of its orbits. Z. L. Yang of the Chinese Academy of Sciences and colleagues…
NASA's James Webb Space Telescope has measured the distance to what the agency calls the most distant fast radio burst seen to date, and the galaxy it came from is a small dwarf rather than the…
Aim the James Webb Space Telescope at a deep enough patch of sky and tiny, intensely red specks emerge from the noise, most numerous in the earliest parts of the universe. Look at the same kind of…
An undergraduate at the University of California, Berkeley has reported finding three faint dwarf galaxies near the spiral M101, known as the Pinwheel Galaxy, that appear to have stopped making stars…
X-ray astronomers have spent decades watching V4641 Sagittarii at its loudest. The system is a black hole pulling gas off a companion star in the constellation Sagittarius, and every few years it…
Carlos del Burgo Olivares and colleagues report that ultraviolet light and warming turn frozen hydrogen sulfide into solid rings and chains of sulfur in laboratory ice, and that adding water ice…
Astronomers have measured the oxygen in nine of the earliest known galaxies directly, instead of inferring it from the indirect calibrations the field normally falls back on at these distances.…
A new cosmological simulation reproduces a pattern astronomers have already measured in the Milky Way's faintest companion galaxies, and its authors attribute that pattern to the explosions of the…
Astronomers have detected a faint radio source at the position of SN 2025ulz, the exploded star that appeared in the same patch of sky, at the same moment, as a weak gravitational-wave candidate in…
IC 443 and W44 are among the best mapped pieces of debris in the Milky Way. Each is the expanding shell of a star that exploded, and each is driving a shock wave into a neighboring molecular cloud.…
Astronomers have collected light from far earlier in cosmic history than this. What they have rarely had, that far out, is a case with enough evidence to narrow down what they are seeing. A faint dot…