All articles tagged with #stellar stream
The Vera Rubin Observatory's first images have revealed a massive, previously unseen stellar stream extending from galaxy Messier 61, dwarfing known streams in size and offering new insights into galaxy interactions and dark matter, with more discoveries anticipated as the observatory begins its full survey.
Astronomers using ESA's Gaia satellite and the MMT Observatory have studied the peculiar stellar stream Theia 456, revealing it consists of about 2,100 stars with a total mass of approximately 900 solar masses. The stream, which formed as a low-density open cluster 245 million years ago, is expected to become undetectable in less than 100 million years due to its increasing dispersion.