You're seeing an animation that goes between an example of what you would see if you don't use this technique -- in other words, just a picture that shows the stars -- and the box is centered on the center of the galaxy, where we think the black hole is.
你可以看到一个动画呈现 一幅你只有不应用这个技术才可以看到的画面 换句话说，就是一幅星象图 这个方块位于整个星系的中心 也就是黑洞的所在