New Hubble data shows definitive evidence of a dwarf galaxy merging with the young Milky Way in the earliest phases of its evolution.

A close-in brown dwarf is a rare sight; but finding one around a massive, aging star is even rarer. Today's authors explore HIP 61637 b, an exciting case study that challenges known brown dwarf format...

Binary black holes eventually inspiral and merge. That's why the OJ 287 system is destined for the most energetic event in history.

The typical galaxy in the local Universe is expected to be in a self-regulated quasi-equilibrium, displaying a settled morphology that falls within the Hubble sequence. The Arp and Arp─Madore catalogs...

YouTube video by AAS

Astronomers using NSF’s VLA and GBT, along with NASA’s Hubble Space Telescope, have confirmed Cloud-9 near M94 as a starless, dark-matter–dominated gas cloud—offering rare evidence for long-predicted ...

Avi Loeb continues to claim that 3I/ATLAS has many anomalous behaviors that lead to the conclusion that it “might” be an alien spacecraft.  He carefully hedges the probability that it is a spacecraft ...

A gallery of images from NASA missions observing the rare, interstellar comet 3I/ATLAS.

NASA’s James Webb Space Telescope has delivered a first of its kind: a crisp mid-infrared image of a system of four serpentine spirals of dust, one expanding

At just 25, Cecilia Payne-Gaposchkin applied quantum physics to a treasure trove of astronomical observations to show that stars are mostly hydrogen and helium.