Arp 93：宇宙的拥抱
(原标题: Arp 93: A Cosmic Embrace)
2023-08-16
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在这张清晰的望远镜视野的中心，两个大星系被锁在宇宙的怀抱中正在合并。这个编号为Arp 93的相互作用系统距离地球天空中的水瓶座约2亿光年。这两个星系分别被确定为NGC 7285（右）和NGC 7284。它们明亮的核心仍然相距大约2万光年，但由于它们持续的引力相互作用，一股巨大的潮汐流向画面底部延伸了20万光年。相互作用的星系确实看起来很奇怪，但现在人们认为在宇宙中很常见。事实上，在离我们更近的地方，我们知道巨大的螺旋形仙女座星系正在接近银河系。Arp 93很可能是他们遥远未来宇宙拥抱的一个类似物。值得注意的提交给APOD：英仙座流星雨2023
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Locked in a cosmic embrace, two large galaxies are merging at the center of this sharp telescopic field of view. The interacting system cataloged as Arp 93 is some 200 million light-years distant toward the constellation Aquarius in planet Earth's sky. Individually the galaxies are identified as NGC 7285 (right) and NGC 7284. Their bright cores are still separated by about 20,000 light-years or so, but a massive tidal stream, a result of their ongoing gravitational interaction, extends over 200,000 light-years toward the bottom of the frame. Interacting galaxies do look peculiar, but are now understood to be common in the Universe. In fact, closer to home, the large spiral Andromeda Galaxy is known to be approaching the Milky Way. Arp 93 may well present an analog of their distant future cosmic embrace. Notable submissions to APOD: Perseids Meteor Shower 2023
© Mike Selby