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November 8, 2025<\/p>\n
2 min read<\/p>\n
Rubin Observatory Discovers Surprise \u2018Tail\u2019 on Iconic Galaxy<\/p>\n
The first image from the Vera C. Rubin telescope reveals a previously unnoticed feature of the galaxy M61 that may explain its mysterious properties<\/p>\n
Galaxy M61 sports a long stellar stream, which had not been spotted before now.<\/p>\n
NSF\u2013DOE Vera C. Rubin Observatory\/NOIRLab\/SLAC\/AURA\/A. Romanowsky et. al.<\/p>\n
Mere months after its long-awaited debut, the Vera C. Rubin Observatory is beginning to deliver on its promise to rewrite cosmic history. The observatory\u2019s colossal camera \u2014 perched atop a mountain in Chile \u2014 has yet to begin its official scientific survey. But just by perusing its first test image, astronomers have uncovered a surprise: a trail of light \u2014 called a stellar stream \u2014 extending from a well-known galaxy, suggesting that the galaxy once tore apart a much smaller one.<\/p>\n
\u201cThis is the first stellar stream detected from Rubin,\u201d says Sarah Pearson, an astrophysicist at the University of Copenhagen. \u201cAnd it\u2019s just a precursor for all of the many, many features we\u2019ll find like this.\u201d The authors reported their findings in the Research Notes of the American Astronomical Society.<\/p>\n
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The galaxy, named Messier 61, was first spotted in 1779 in the Virgo Cluster of galaxies and has caught the gaze of astronomers ever since. Hosting a slew of supernovae and churning out new stars at a surprisingly high rate, Messier 61 is what\u2019s known as a starburst galaxy owing to its bounty of stellar activity.<\/p>\n
Astronomers have enlisted some powerhouse telescopes \u2014 including the James Webb Space Telescope and the Hubble Space Telescope \u2014 to unravel the galaxy\u2019s structure. But \u201cdespite all of this intense study, no one had ever found this stellar stream\u201d, says Aaron Romanowsky, an astronomer at San Jose State University in California and an author of the study.<\/p>\n
After scrutinizing Rubin\u2019s first image \u2014 captured by the world\u2019s largest-ever digital camera \u2014 the team filtered out excess light to reveal the galaxy\u2019s stellar stream. The trail of stars is 55 kiloparsecs or 180,000 light years long, making it one of the longer streams discovered. It probably originated from a dwarf galaxy that was shredded apart by Messier 61\u2019s gravity. Such an interaction could have boosted star formation in Messier 61 and might begin to explain some of the galaxy\u2019s abnormalities, the authors note.<\/p>\n
Rubin\u2019s first image captures ten million galaxies, and it\u2019s only an appetizer for the observations to come. Over the next decade, Rubin will capture light from 20 billion galaxies \u2014 more than any other observatory so far.<\/p>\n
\u201cThe expectation is that every single galaxy should be surrounded by these streams. It’s a fundamental part of how the galaxies are made,\u201d Romanowsky says. \u201cWe just need to look fainter, and that\u2019s the hope with Rubin.\u201d<\/p>\n
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