Tuesday, 19 January, 2021 - 07:00 A view of the Milky Way from an area of Puyehue National Park near Osorno City, Chile, May 8, 2008. Reuters. Cairo - Hazem Badr A research team from the Northwestern University discovered that a stellar stream in the Milky Way galaxy- to which belongs our planet- houses a large cluster of stars that were born at the same time and travel in the same direction. While researchers have long known that stars form in groups, most known clusters are spherical in shape. Only recently have astrophysicists started to find new patterns in the sky. They believe long strings of stars were once tight clusters, gradually ripped apart and stretched by tidal forces.