高度不规则的星系 ESO 174-1 在 NASA/ESA哈勃太空望远镜拍摄的这张图像中占据主导地位，它就像明亮恒星背景下的一朵孤独、朦胧的云。ESO 174-1距地球约1100万光年，由明亮的恒星云和暗淡、蜿蜒的暗气体和尘埃卷须组成。
这张图像是哈勃观测数据集的一部分，旨在更好地了解我们附近的银河邻居。这些观测旨在解析 10 兆秒差距内最亮的恒星和每个已知星系的基本特性。秒差距是天文学家用来测量距其他星系距离的单位——10兆秒差距相当于3200万光年——这使得天文距离更容易处理。例如，距太阳最近的恒星比邻星 (Proxima Centauri) 距离太阳约 1.3 秒差距。以日常单位计算，这是惊人的 25 万亿英里（40 万亿公里）！
捕获所有邻近星系的计划旨在利用两次观测之间 2-3% 的哈勃可用时间。哈勃对天空相对位置的物体进行连续观测的效率很低。像捕获 ESO 174-1 这样的观测程序填补了其他观测之间的空白。这样望远镜就可以逐渐从一个观测移动到另一个观测，同时仍然收集数据。这些补充观测计划充分利用了哈勃观测时间的最后一分钟。
文字来源：欧洲航天局 (ESA)
图片来源：ESA/Hubble & NASA, R. Tully
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