Astrophysics

A dwarf-galaxy transient first spotted in 2019 developed radio emission so bright, years later, that a Chinese-led team says it may define a new class of relativistic explosion.

oMEGACat BH-2, a 4.46-solar-mass black hole orbited by a main-sequence star once every 94 years, is the first stellar-mass black hole detected in the globular cluster Omega Centauri.

A low-mass black hole in a spiral galaxy 1.8 billion light-years away has stayed radio-bright for at least eight years, a transition astronomers say has never been observed before.

Juno detected electrons reaching 1 MeV in Jupiter's foreshock, and the authors derive a scaling law linking shock size to maximum particle energy.

A Penn State-led study in Physical Review Letters argues that the highest-energy cosmic rays, including the Amaterasu particle, may be nuclei heavier than iron that lose energy slowly enough to reach Earth.

NIRSpec spectroscopy of COLA1 and NEPLA4 reveals black holes 400-800 times overmassive for their host galaxies, offering the first detailed look at the aftermath of early-universe quasar activity.

A UC Riverside-led team used the largest JWST observing program to trace galaxies along the cosmic web from today out to redshift z ~ 7, and released the full pipeline and catalog publicly.

NGC 1052-DF9 is the third ultra-diffuse galaxy found lacking dark matter in a linear trail near NGC 1052, lending significant support to the Bullet Dwarf collision theory and challenging alternative gravity models.

The fourth gravitational wave transient catalog adds 128 new detections from a nine-month observing run, including the heaviest and fastest-spinning black hole mergers ever recorded.

Two March discoveries reveal a 10-billion-year-old lava world with a thick atmosphere and a sulfur-dominated planet unlike anything in existing classification systems.