... The Sun Sets on Comet Hyakutake . ... Comet Hyakutake is seen here just as the Sun sets on April 22. As April draws to a close, Comet Hyakutake will be visible only just after sunset and will be hard to discern against the brightly lit sky. ... G1, pictured above, is the brightest known globular cluster in the whole Local Group of galaxies. ... In the center of M51, a spiral galaxy 23 million light-years away, astronomers have identified a dense region of young stars. ... April . ...