8+ hour, 54+ min ago   (878+ words) What happens to Webb’s mysterious little red dots as the universe ages? The Saguaro galaxy’s red nucleus offers a way to explore their hidden surroundings. When the James Webb Space Telescope began finding tiny, intensely red sources in the early…...

1+ day, 5+ hour ago   (378+ words) The small moons inside Neptune’s rings may be the surviving debris of a much larger moon system destroyed when Triton was captured billions of years ago. Neptune’s smallest moons look like minor members of the solar system. They are difficult…...

1+ day, 5+ hour ago   (282+ words) Dark photons are one proposed explanation for dark matter. A new calculation suggests that the early universe’s plasma may have stopped them from depositing heat as efficiently as earlier models predicted. The post Early-Universe Plasma May Have Kept Dark Photons…...

1+ day, 6+ hour ago   (603+ words) The enormous Cygnus Bubble is usually linked to a busy star-forming region. A new study argues that the microquasar Cygnus X-3 may be the more natural source of its highest-energy gamma rays. Cygnus X-3 is a microquasar, a binary system containing a…...

1+ day, 7+ hour ago   (663+ words) The cosmic microwave background is the oldest light we can observe. Here is where it came from, what its tiny patterns reveal, and why it still matters. About 380,000 years after the Big Bang, the expanding universe had cooled enough for…...

1+ day, 8+ hour ago   (476+ words) A sub-threshold Einstein Probe X-ray flash was found after ZTF spotted supernova SN 2025wkm. Researchers link the signal to shock breakout and a possible magnetar-powered engine. EP250827b was a soft X-ray flash that lasted more than 1,000 seconds. Spectral fits put its peak…...

2+ day, 6+ hour ago   (251+ words) Tiny minerals inside one of the most pristine meteorites ever found still carry a record of magnetism from the solar system’s first 200,000 years. Tiny mineral grains inside an Antarctic meteorite may preserve the oldest evidence yet of a magnetic field…...

3+ day, 23+ hour ago   (924+ words) Hubble has found a growing ten-sided atmospheric wave around Saturn’s south pole—the first large regular-sided jet seen there. Saturn has long been known for a strange shape in its clouds. A vast hexagon circles the planet’s north pole, holding…...

4+ day, 1+ hour ago   (1203+ words) Twenty-seven faint objects beyond Neptune are giving astronomers a rare look at the planet-building material that survived when the outer solar system stopped growing. The outer solar system is not empty. Beyond Neptune, in the cold region known as the…...

4+ day, 2+ hour ago   (1153+ words) The objects are unusually soft in X-rays but bright in extreme ultraviolet light—exactly the combination that makes them difficult to find and potentially important to the history of stars and galaxies. A galaxy can be full of powerful objects…...