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
Eli5: The same way that you can put a banana on a counter and can say, “In a week or two this banana is going to be withered and moldy.”
The arrow of time moves forward, and knowing the natural progression of things based on similar observations allows us to make these predictions.
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