The youngest
stars in the galactic region surrounding
around the Solar Neighborhood are associated with «subgroup B1» of the Pleiades (M 45) stellar moving group, and astronomers hypothesize that the more massive
stars born in this group may have already exploded as 20 or so supernovae over the past 10 to 20 million years as the entire group of
stars moved through a
nearby region of the Local Bubble (Berghoefer and Breitschwerdt, 2002).