Supernovae in NGC 2770
Explanation: The stellar explosions known as supernovae are among the most powerful events in the universe. Triggered by the collapsing core of a massive star or the nuclear demise of a white dwarf, supernovae occur in average spiral galaxies only about once every century. But the remarkable spiral galaxy NGC 2770 has lately produced more than its fair share. Two still bright supernovae and the location of a third, originally spotted in 1999 but now faded from view, are indicated in this image of the edge-on spiral. All three supernovae are now thought to be of the core-collapse variety, but the most recent of the trio, SN2008D, was first detected by the Swift satellite at more extreme energies as an X-ray flash (XRF) or possibly a low-energy version of a gamma-ray burst on January 9th. Located a mere 90 million light-years away in the northern constellation Lynx, NGC 2770 is now the closest galaxy known to host such a powerful supernova event.转自NASA
URL：http://apod.nasa.gov/apod/ap080118.html 一见英文头都大了。
是NGC 2770中的超新星吗？ 应该是常新星吧yct30.gif 晕打错了 是超新星！汗yct41.gif 说明：超新星爆炸是宇宙中能量最强的恒星爆炸事件。由于大质量恒星核或白矮星致密星核坍塌引发，但一般一个旋涡星系在一个世纪内才会发生一次超新星暴发。但在壮观的旋涡星系NGC2770发生的事件打破了这个常规。在这张影像中，有两颗仍然明亮的超新星，但是在1999年发现的第三颗超新星已经在原本位置上看不到了，其位置就在影像旋臂边缘标明处。三个超新星现在被认为是星核坍塌类型，但是三个超新星中最近发现一颗SN2008D，首次由斯威夫特卫星在1月9日监测到了极高能x射线(XRF)或低能伽马射线爆发．NGC2770位于距离我们大约9千万光年元的天猫座内，是迄今为止拥有如此高能超新星事件最近星系．
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