... Clouds, Comet, and Crescent Moon . ... The scene captures naked-eye Comet PanSTARRS peeking into northern hemisphere skies on March 12. The comet stands over the western horizon after sunset, joined by the thin, flattened crescent of a day old Moon. ... Spin up of a Supermassive Black Hole . ... Sweeping quickly through southern skies on March 5, Comet PanSTARRS (C/2011 L4) follows the Sun toward the western horizon in this twilight scene. ... Comets Lemmon and PanSTARRS Peaking . ... March . ...