Few things combine as perfectly as moonlight, clouds and stars, especially when they're in the sky over Mungo National Park in southeastern Australia.  Just to the right of the tank lie the four stars of the famous Southern Cross and, to its right, the two bright stars Beta and Alpha Centauri.  Alpha is the nearest star system beyond our sun at a distance of about 26 trillion miles (or 4.3 light years).  Above the tank appears a diffuse pink smudge—the beautiful Eta Carina Nebula.