Thursday, July 30, 2026

What Killed Galaxies in the Early Universe?

An artist’s impression of the galaxy CRISTAL-02, with a huge plume of cold gas extending away from it. This plume is almost as long as the galaxy itself, which is a telltale sign that gas is being driven out of the galaxy. Credit Joshua Worth via Creative Commons CC-BY license
Licence type Attribution (CC BY 4.0)

Galaxies in the infancy of the Universe are the building blocks of more modern galaxies. They began as small "shreds" of material that coalesced over time to form larger ones. That's why astronomers use observatories such as the James Webb Space Telescope (JWST) to study the young Universe. The light from those early objects appears in the infrared part of the spectrum, which JWST is tuned to see.



Radio Array Detects Polarized Light From a GRB

This illustration depicts Faraday rotation in the afterglow of a gamma-ray burst. A powerful jet (upper left) sends polarized radio waves outward through the thin wall of a surrounding bubble of magnetized gas called an HII region. As the light passes through this material, its polarization angle is twisted by the magnetic field. Because the effect is stronger at longer wavelengths, the red and blue waves, which represent different radio wavelengths, exit the bubble oscillating in different directions. By measuring this difference, astronomers were able to map the magnetic environment surrounding GRB 260310A for the first time. Credit: NSF/AUI/NSF NRAO/M.Weiss

On March 10, 2026, the Fermi telescope gamma-ray burst team reported the detection of a long-duration gamma ray burst that occurred when a star exploded inside a dense, highly magnetized cloud of hydrogen gas. That HII region is a bubble of ionized hydrogen created by winds from a massive young star. Astronomers immediately turned as many telescopes as possible to view the burst and its afterglow, including the NSF's Karl Jansky Very Large Array.



Wednesday, July 29, 2026

The Risks of Debris Between the Earth and the Moon for Future Exploration

Diagram of the flight path and retrograde orbit of the Artemis I mission that took it around the Moon. Credit: NASA

A new study from the Chinese Academy of Sciences (CAS) addresses the threat of debris in cislunar space, which could pose threats for future missions bound for the Moon.



Radio Astronomy is Getting a Big Boost from the VLA's New Sky Survey

The Karl G. Jansky Very Large Array in New Mexico. The VLA was upgraded in recent years, and its new sky survey is complete. It's the most detailed radio survey of the sky ever taken. Image Credit: By user:Hajor - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=138997

The National Radio Astronomy Observatory has completed a new survey with the updated Karl G. Jansky Very Large Array (VLA) in New Mexico. It's called the VLASS, the Very Large Array Sky Survey, and it's the most detailed radio survey of the sky ever completed. The VLA used the power of its 28 movable dishes to complete the survey.



White Dwarfs Eat More Planetary Debris Than Thought, But Magnetic Fields Hide It

This artist's illustration shows a white dwarf surrounded by a debris disk. Astronomers are finding more and more white dwarfs with metallic debris disks, which suggests the debris comes from planetary systems. New research examines how white dwarfs accrete this debris, showing that it's much more common than thought, and that white dwarfs accrete more planetary debris than thought. Image Credit: NASA, ESA, and G. Bacon (STScI)

Planetary debris disks around white dwarfs appear to be more plentiful than thought. That's because some white dwarfs are magnetic, and those magnetic fields create patches of metallic debris near the stars' poles, where it's more difficult to detect. This leads to an underestimation of debris, something new research is trying to correct.



Tuesday, July 28, 2026

A Wandering Black Hole Meets a Wandering Star

Artist's conception of a tidal disruption event that occurs when a star wanders too close to a supermassive black hole. Courtesy NRAO/AUI/NSF/NASA Hill

What happens when a black hole and a star meet in the middle of nowhere in a galaxy? It sounds like it could be a dramatic science fiction backdrop, with some hapless starship caught in the crunch. Actually, such encounters in real life are pretty rare. They happen maybe once every 100,000 years. But, when they do occur, the immense gravity of the supermassive black hole tears the star apart. It's an eerie-looking process. The star gets "spaghettified" — that is, pulled on one side by the black hole. That rips out a stream of gas from the star which eventually forms a disk around the black hole.



Samples of Lunar Rock Are Leading Scientists to Rethink the Moon's History

Image of the far side of the Moon taken by NASA's Lunar Reconnaissance Orbiter (LRO). Credit: NASA

Based on a new analysis of the Chang'e-6 lunar samples, scientists are again questioning the timing and intensity of the Late Heavy Bombardment period.