Документ взят из кэша поисковой машины. Адрес оригинального документа : http://zebu.uoregon.edu/messier/m1.txt Дата изменения: Fri Mar 25 12:37:04 1994 Дата индексирования: Mon Oct 1 21:19:04 2012 Кодировка:

M1 is also known as the Crab Nebula. It is a remant of a supernova
that occured in 1054 AD. The central star is actually a rotating
neutron star and is called a pulsar.

This exposure was taken through a narrow band H-alpha filter to make
the filamentary structure stand out somewhat.