2+ week, 6+ day ago   (617+ words) The result, published in Nature Astronomy, is that nine massive galaxies in the early universe are hiding a large population of small, dim, low-mass stars behind the blinding light of their giant counterparts. Those hidden stars add mass. For at…...

5+ day, 7+ hour ago   (374+ words) The spectrum added two more clues: broad, multi-peaked hydrogen emission combined with hydrogen absorption features, and tentative variability between two observations taken roughly a year apart. Black holes flicker as their feeding rates change. Stars don’t. The mechanism, once stated…...

1+ week, 7+ hour ago   (770+ words) “In our simulations, the host galaxies alone caused the same kinds of irregularities that we observe in real stellar streams,” said Arpit Arora, a postdoctoral scholar at the UW Department of Astronomy and the study’s lead author. The team built…...

9+ hour, 24+ min ago   (429+ words) Chariklo’s inner ring is getting denser. Its outer ring is fading. Both changes are happening at the same time — and, for the moment, nobody knows why. The finding matters beyond Chariklo itself. Ring systems around planets had already shown that…...

3+ week, 3+ day ago   (175+ words) The Lense-Thirring effect causes the plane of a star’s orbit around a spinning body to precess — to slowly rotate — at a rate that scales with the black hole’s spin parameter. For S301, the team calculates that this precession will accumulate to…...

2+ week, 1+ day ago   (379+ words) They have now published their response in the same journal that ran the original challenge. The universe is still accelerating. The Nobel Prize is still justified. The mystery, though, is as deep as it has ever been. Dr. Phil Wiseman…...

2+ week, 4+ day ago   (477+ words) The Hubble tension adds a second pressure point. If the standard model is correct, both the early-universe and local measurements should converge on the same expansion rate. They do not. The most recent analysis using JWST-calibrated Cepheids confirms the local…...

1+ week, 1+ day ago   (695+ words) The finding, in Nature Astronomy, comes from researchers at the Chinese Academy of Sciences and their international partners in the DESI collaboration. It is the largest direct measurement of cosmic hydrogen reserves ever made. It resolves a decades-old question about…...

1+ week, 5+ day ago   (385+ words) NASA’s IXPE has now changed that. By pointing its X-ray polarimetry instruments at magnetar 1E 1547.0-5408 for more than 140 hours, a team led by Rachael Stewart at George Washington University and Hoa Dinh Thi at Rice University found polarization values that nothing…...

6+ day, 7+ hour ago   (271+ words) The result covers two redshift windows, z ≈ 0.32 and z ≈ 0.44, corresponding to hydrogen variations measured across scales of several million light-years, roughly comparable to the separation between the Milky Way and Andromeda. It is a narrow slice of cosmic history. But…...