"The discovery of this stream highlights how much is still unknown about the life histories of galaxies, how the hidden universe shapes the realms that we can see."

Rubin Observatory peers into the 'hidden universe' and discovers stream of stars longer than our entire Milky Way

Source: space
Source Link: https://www.space.com/astronomy/rubin-observatory-peers-into-the-hidden-universe-and-discovers-stream-of-stars-longer-than-our-entire-milky-way