出典:Wikipedia
出典:『Wikipedia』 (2011/03/15 11:06 UTC 版)
NGC 4151 (or Eye of Sauron) is an intermediate spiral Seyfert galaxy located 43 million light years from Earth in the constellation Canes Venatici, discovered by John Frederick William Herschel on March 17, 1787. It is one of the nearest galaxies to Earth to contain an actively-growing supermassive black hole.