The constellation Gemini hosts a special feature known as the Castor Moving Group. This is a group of stars that share similar proper motions and are believed to have a common origin. The group is named after the star Castor, which is one of the brightest stars in the constellation.
The Castor Moving Group is thought to be around 100 million years old and is one of the youngest known moving groups in the night sky. It consists of about 20 stars, including several binary and multiple star systems. The group is spread over an area of about 150 light-years across and is located about 50 light-years from Earth.
The common proper motion of the stars in the Castor Moving Group suggests that they were all formed at the same time and place. It is believed that the group originated in a cluster of stars that has since dispersed. The Castor Moving Group is a valuable tool for studying the formation and evolution of stars and stellar systems.