Who discoverd the stars of Ursa Major and when was it discovered?
The Ursa Major Moving group is also sometimes referred to as Collinder 285. It is a group of stars which are the closest moving group to earth. Most of the stars of the Big Dipper are in the Ursa Major Moving Group. These stars all have a common velocity in space and are believed to also share a common origin. All stars in the Ursa Major Moving Group are in roughly the same location in the Milky Way Galaxy, are moving in roughly the same direction at roughly the same speed, contain roughly the same mix of metals, and, based on stellar theory, appear to be roughly the same age. This evidence suggests to astronomers that the stars in the group share a common origin. Based on the ages of its constituent stars, the Ursa Major Moving Group is believed to have once been an open cluster, having formed from a protostellar nebula approximately 500 million years ago, which is fairly young. Since that distant time in the past, the sparse group has been scattered over a region about 30 by 18 light
