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__NOTOC__ NGC 2207 and IC 2163 are a pair of colliding spiral galaxies about 80 million light-years away〔 in the constellation Canis Major. Both galaxies were discovered by John Herschel in 1835. So far, four supernovae have been observed in NGC 2207: * type Ia SN 1975a in January 1975 * type Ib SN 1999ec in October 1999 * type Ib SN 2003H—discovered halfway between the two galaxies * type II supernova SN 2013ai in March 2013 NGC 2207 is in the process of tidally stripping IC 2163. ==Merging galaxies== NGC 2207 is in the process of colliding and merging with IC 2163. But unlike the Antennae or the Mice Galaxies, they are still two separate spiral galaxies. They are only in the first step of colliding and merging. Soon they will collide, probably looking a bit more like the Mice Galaxies. In about a billion years time they are expected to merge and become an elliptical galaxy or perhaps a disk galaxy. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「NGC 2207 and IC 2163」の詳細全文を読む スポンサード リンク
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