Astronomers spot 1st-ever galactic merger aftermath in a spiral galaxy
Astronomers using the Vera C. Rubin Observatory just found a super-faint trail of stars stretching behind the spiral galaxy M61—evidence that this galaxy once collided with a smaller neighbor.
It's the first time this observatory has caught something like this, and it helps us piece together how galaxies grow and change.
The faintest of streams
The star stream is extremely faint—barely visible in deep images. It likely formed when M61 absorbed another galaxy in the Virgo Cluster, 52 million light-years away.
The Rubin Observatory's powerful sensors made spotting this possible.
Understanding the universe's history
Finding streams like this helps scientists understand how galaxies like M61—and even our own Milky Way—get their shapes and features over time.
Each new discovery gives us more clues about epic cosmic collisions that shaped the universe as we know it.