File:NGC3972 - HST- Potw1810a.jpg:修订历史

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  • 当前之前 12:572018年3月5日 (一) 12:57Jmencisom 留言 贡献 1,951字节 +27 added Category:Hubble images 撤销 标签HotCat
  • 当前之前 10:462018年3月5日 (一) 10:46SchlurcherBot 留言 贡献 1,924字节 −21 Remove duplicate headings 撤销
  • 当前之前 06:292018年3月5日 (一) 06:29Fabian RRRR 留言 贡献 1,945字节 +1,945 =={{int:filedesc}}== {{Information |description={{en|1='''Galaxy full of cosmic lighthouses This enchanting spiral galaxy can be found in the constellation of Ursa Major (the Great Bear). Star-studded NGC 3972 lies about 65 million light-years away from the Earth, meaning that the light that we see now left it 65 million years ago, just when the dinosaurs became extinct. NGC 3972 has had its fair share of dramatic events. In 2011 astronomers observed the explosion of a type Ia supernova in the galaxy (not visible in this image). These dazzling objects all peak at the same brightness, and are brilliant enough to be seen over large distances. NGC 3972 also contains many pulsating stars called Cepheid variables. These stars change their brightness at a rate matched closely to their intrinsic luminosity, making them ideal cosmic lighthouses for measuring accurate distances to relatively nearby galaxies. Astronomers search for Cepheid variables in nearby galaxies which also contain a...