Galaxies
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The Milky Way's faintest satellite may not be what astronomers thought. 'These results solve a major mystery in astrophysics'
By Samantha Mathewson published
A distant galaxy nicknamed "Cosmic Grapes" is bursting with massive star-forming clumps — far more than expected — offering fresh clues about how galaxies grew in the early universe.

Discovery of 250 'mini galaxies' could help scientists pin down the nature of dark matter
By Victoria Corless published
Only a fraction of the size of the Milky Way, these galaxies have thus far been too faint for most telescopes to spot.

These gorgeous new images of the cosmos from NASA's Chandra X-ray telescope took our breath away (video)
By Samantha Mathewson published
NASA has unveiled a dazzling new collection of cosmic images from the Chandra X-ray Observatory, capturing spectacular stars and galaxies in unprecedented detail.

Astonishing 'halo' of high-energy particles around giant galaxy cluster is a glimpse into the early universe
By Robert Lea published
A distant cluster of galaxies is wrapped in a vast halo of high-energy particles that could be the work of supermassive black holes or a cosmic particle accelerator.

This galaxy cluster has mysterious cosmic tendrils over 200,000 light-years long (image)
By Robert Lea published
Astronomers have taken an unprecedentedly detailed look at the tendrils and filaments that wrap around supermassive black hole-dominated galaxies of Abell 2255.

Scientists spot high-speed galaxy collision 11 billion light-years away: 'We hence call this system the cosmic joust'
By Sharmila Kuthunur published
A galactic collision 11 billion light-years away reveals how an actively feeding supermassive black hole disrupts star formation in a nearby galaxy.

NASA diagnoses fracture in a 'huge cosmic bone' using X-ray observatory
By Stefanie Waldek published
A combination of X-ray from NASA's Chandra observatory and radio data indicates that a galactic "fracture" was likely caused by a special neutron star called a pulsar.

Gaze at a cluster of glowing galaxies | Space photo of the day for May 2, 2025
By Robert Z. Pearlman published
Galaxy cluster Abell 1489, as imaged by the International Gemini Observatory, contains more than 200 of the gravitationally-bound systems of stars, stellar remnants, interstellar gas and dust.
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