单词：diffraction spectroscope
衍射分光镜
单词：diffraction spectroscope 相关文章
By measuring how fast these stars were moving, he could prove if there really was a black hole at the center of an active galaxy. I picked a galaxy nearby which is called NGC 1068, an active galaxy, w
发表于:2018-12-07 / 阅读(401) / 评论(0)
超大质量黑洞
超大质量黑洞