20h M31

By stacking our frames together, we've imaged the Andromeda Galaxy over a total of 20 hours, which greatly improved the signal‑to‑noise ratio. In the future, we can try longer exposure times to bring out even more fine details. 通过一起叠图，和大家拍了20小时的仙女座大星云，信噪比得到了很大的提升，以后可以尝试一下更长的时长，拍出更多的细节