===图片===
#https://upload.wikimedia.org/wikipedia/commons/b/b1/NGC7293_%282004%29.jpg?uselang=zh-cn
#https://upload.wikimedia.org/wikipedia/commons/6/63/Keyhole_Nebula_by_2MASS.jpg?uselang=zh-cn
#https://commons.wikimedia.org/wiki/File:Nebulosa_de_Eta_Carinae_o_NGC_3372.jpg?uselang=zh-cn
#https://commons.wikimedia.org/wiki/File:Veil_Nebula_-_NGC6960.jpg?uselang=zh-cn
#https://commons.wikimedia.org/wiki/File:Veil_Nebula_Complex_NGC_6960,_6992,_6995,_6974,_6979,_IC_1340.jpg?uselang=zh-cn
#
===工具===