... Simeis 188 in Stars, Dust and Gas . ... A particularly colorful case is the star forming region Simeis 188 which houses an unusual and bright cloud arc cataloged as NGC 6559 . ... The first massive stars formed from the dense gas will emit energetic light and winds that erode, fragment, and sculpt their birthplace. ... After tens of millions of years, the dust boils away, the gas gets swept away, and all that is left is a naked open cluster of stars. ... NGC 6188 and NGC 6164 . ...