Researchers used Gaia data to find a stellar stream of at least 4,000 stars that have been moving together in space since they formed, about a billion years ago.
Eleanor Imster has helped write and edit EarthSky since 1995. She was an integral part of the award-winning EarthSky radio series almost since it began until it ended in 2013. She and her husband live in Tennessee, where they enjoy guitar playing and singing. They have 2 grown sons.