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Vera C. Rubin Observatory Discovers Massive Stellar Stream

11/21/2025

Summary

Story summary

The Vera C. Rubin Observatory has identified a vast stellar stream trailing the nearby galaxy M61, about 170,000 light-years long and 10,000 light-years wide.
The stream is believed to be the remnants of a dwarf galaxy disrupted by M61's gravity.
The feature had gone unnoticed despite M61 being studied, underscoring the Rubin Observatory's imaging capabilities and the Legacy Survey of Space and Time (LSST) to illuminate galactic evolution and interactions.

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Story summary

The Vera C. Rubin Observatory has identified a vast stellar stream trailing the nearby galaxy M61, about 170,000 light-years long and 10,000 light-years wide.
The stream is believed to be the remnants of a dwarf galaxy disrupted by M61's gravity.
The feature had gone unnoticed despite M61 being studied, underscoring the Rubin Observatory's imaging capabilities and the Legacy Survey of Space and Time (LSST) to illuminate galactic evolution and interactions.