People are saying that The Pillars Of Creation have been destroyed, and will take 400-500 Million light years to reach us. Can someone explain how do we know it when the light hasn’t reached us?
In: 1444
Let’s say you see image of a falling glass. You can calculate it will hit the ground in exactly 1 second and you know it will shatter in pieces. If I tell you that this image is from 5 seconds ago, you know that the glass is shattered even if you didn’t see the landing itself.
That’s how Pillars work. We predicted that they will be destroyed in X years and we know that they are less than X light years from us. Thus, their destruction has already occured.
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