Arp 78：白羊座的特殊星系
(原标题: Arp 78: Peculiar Galaxy in Aries)
2022-03-24
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奇特的螺旋星系Arp 78被发现在头部强星座白羊座的边界内。在我们银河系的恒星和星云之外大约1亿光年的地方，这个宇宙岛的直径超过10万光年。它也被称为NGC 772，在这幅详细的宇宙肖像中，它有一个突出的外旋臂，这是由位于夏威夷茂纳克山顶附近的大型双子座北望远镜拍摄的。沿着尘埃带和年轻的蓝色星团的轨迹，Arp 78的螺旋臂很可能是由星系尺度的引力潮汐相互作用而膨胀起来的。这个密切的伴星星系是NGC 770，位于这幅图的右上方。但更遥远的背景星系在宇宙视野中清晰可见。
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Peculiar spiral galaxy Arp 78 is found within the boundaries of the head strong constellation Aries. Some 100 million light-years beyond the stars and nebulae of our Milky Way galaxy, the island universe is over 100,000 light-years across. Also known as NGC 772, it sports a prominent, outer spiral arm in this detailed cosmic portrait from the large Gemini North telescope near the summit of Maunakea, Hawaii, planet Earth. Tracking along sweeping dust lanes and lined with young blue star clusters, Arp 78's spiral arm is likely pumped-up by galactic-scale gravitational tidal interactions The close companion galaxy responsible is NGC 770, located off the upper right of this frame. But more distant background galaxies are clearly visible in the cosmic field of view.