May 2011
Intermediate to advanced
256 pages
5h 5m
English
The stunning image on the cover, reminiscent of Sauron’s eye, is M1, the Crab Nebula. M1 is located in Taurus, about one degree to the right of Zeta Tauri, the star at the tip of the bull’s left horn. The crab nebula is the remnant of a super-nova that blew its guts all over the sky on the rather auspicious date of July 4th, 1054 AD. At a distance of 6500 light years, that explosion appeared to Chinese observers as a new star, roughly as bright as Jupiter. Indeed, it was visible during the day! Over the next six months it slowly faded from naked-eye view.
The cover image is a composite of visible and X-ray light. The visible image ...
Read now
Unlock full access