白羊座的特殊星系Arp 78

2020年9月18日

Arp 78: Peculiar Galaxy in Aries
Image Credit & Copyright: Bernard Miller

Explanation: (xxxedit and linkxxx) 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. Also known as NGC 772, the island universe is over 100,000 light-years across and sports a single prominent outer spiral arm in this detailed cosmic portrait. Its brightest companion galaxy, compact NGC 770, is toward the upper right of the larger spiral. NGC 770’s fuzzy, elliptical appearance contrasts nicely with a spiky foreground Milky Way star in matching yellowish hues. Tracking along sweeping dust lanes and lined with young blue star clusters, Arp 78’s large spiral arm is likely due to gravitational tidal interactions. Faint streams of material seem to connect Arp 78 with its nearby companion galaxies.

Tomorrow’s picture: 3D Orion

白羊座的特殊星系Arp 78
影像提供与版权：Bernard Miller

说明：特殊螺旋星系Arp 78在白羊座方向，大约位在我们银河系众星和星云后方1十亿年远距离。这个宽10万多光年，称为NGC 772的星系，在上面这幅细致的影像里，曳着鲜明的单个外螺旋臂。它明亮的伴星系NGC 770，则位在它的右上方。星系NGC 770毛茸茸的椭圆外观，和伴随星芒的黄色银河系前景恒星形成鲜明的对比。星系Arp 78散布着泛蓝年轻星团和蜿蜒蜿蜒埃带的巨大螺旋臂，可能是重力潮汐作用的产物。影像中，还可见到暗淡的物质流，看似是把星系Arp 78和它邻近的伴星系串联起来。

明日的图片：3D Orion