M20与M21
2020年8月6日 Messier 20 and 21 Image Credit & Copyright: Emanuele Petrilli Explanation: The beautiful Trifid Nebula, also kn…
斯皮策望远镜的三叶星云
2020 February 13 Spitzer’s Trifid Image Credit: J. Rho (SSC/Caltech), JPL-Caltech, NASA Explanation: The Trifid Nebula,…
