Ou4：飞蝠之内的乌贼
2020年10月7日 Ou4: A Giant Squid in a Flying Bat Image Credit & Copyright: Yannick Akar Explanation: A very faint but very large squid-like nebula is visible in planet Earth’s sky — but inside a still larger bat. The Giant Squid Nebula cataloged as Ou4, and Sh2-129 also known as the Flying Bat Nebula, are both caught in this cosmic scene toward...