Astronomy Picture of the Day . ... Visible light images show the central region of globular cluster 47 Tucanae is closely packed, with stars less than a tenth of a light-year apart. ... Water Ice in a Maritan Crater . ... The ice pocket was found in a 35-kilometer wide crater that resides 70 degrees north of the Martian equator. ... One of the nearest supernovas of recent years was discovered late last month in the bright nearby galaxy M51. ... Galaxy Group HCG 87 . ... Analemma of the Moon . ...