So its ursa major ? Don't think thats one I can see from home
Dr Fulle ( who took that shot ) is a well known astronomer
his shots of volcanoes are pretty amazing .I find volcanoes incredible and still watch the St Helens doco from time to time .Sadly the only one to correctly predict the nature of that 1980 erruption was on station that morning 10kms away.
http://en.wikipedia.org/wiki/David_A._Johnston
http://en.wikipedia.org/wiki/Mount_St._Helens