... 11 Hour Star Trails . ... The cause, this time, was not a partial lunar phase -- the Moon was full -- but rather that part of the Moon went into Earth's shadow. Star Clusters Young and Old . ... Galactic or open star clusters are relatively young swarms of bright stars born together near the plane of our Milky Way Galaxy. ... The mosaic digitally stitches together fifteen carefully exposed high resolution images of a bright, gibbous Moon and a representative background star field. ...