Astronomy Picture of the Day . ... 22.03.2013 . ... Credit Copyright: Stefan Seip ( TWAN ) Explanation: The broad dust tail of Comet PanSTARRS (C/2011 L4) has become a familiar sight for many northern hemisphere comet watchers, as the comet fades but rises higher above the western horizon after sunset . ... Sweeping away from the Sun and trailing behind the comet's orbit, the curving dust tail also seems to stream away from a shining mountaintop castle . ... Gallery: Comet PanSTARRS . ... March 2013 . ...