星系：哈勃望远镜拍摄的怀尔德三重星系
(原标题: Galaxies: Wild's Triplet from Hubble)
2022-11-08
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这里有多少星系相互作用？这组星系被称为狂野三联体，不仅因为发现者，而且因为出现的明亮星系的数量。这三个星系被认为是相互作用的，但最近的研究表明，只有最亮的两个星系在引力作用下相互作用：顶部和底部的大星系。哈勃太空望远镜拍摄的这张特色图片中，中间的螺旋星系实际上在很远的地方，就像它下面的星系和其他众多星系一样。这两颗巨行星的比拼产生了一个惊人的结果，那就是在它们之间形成了一座由恒星、气体和尘埃组成的巨大桥梁——这座桥梁长约20万光年。我们今天看到的怀尔德三胞胎发出的光大约是2亿年前恐龙在地球上漫游时发出的。也许在10亿年左右的时间里，这两个相互作用的星系将合并成一个单一的大型螺旋星系。2022年11月的月食：提交给APOD的重要作品
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How many galaxies are interacting here? This grouping of galaxies is called the Wild Triplet, not only for the discoverer, but for the number of bright galaxies that appear. It had been assumed that all three galaxies, collectively cataloged as Arp 248, are interacting, but more recent investigations reveal that only the brightest two galaxies are sparring gravitationally: the big galaxies at the top and bottom. The spiral galaxy in the middle of the featured image by the Hubble Space Telescope is actually far in the distance, as is the galaxy just below it and all of the other numerous galaxies in the field. A striking result of these giants jousting is a tremendous bridge of stars, gas, and dust that stretches between them -- a bridge almost 200,000 light-years long. Light we see today from Wild's Triplet left about 200 million years ago, when dinosaurs roamed the Earth. In perhaps a billion years or so, the two interacting galaxies will merge to form a single large spiral galaxy. Lunar Eclipse of November 2022: Notable Submissions to APOD