If an astronomer on a planet in the Galaxy MACS0647-JD (13.5 billion light years away) were to point their telescope toward our Galaxy, what would they see?

When you look into a telescope at the galaxies and stars you are looking back in time, because it took time for the light of those objects to reach you. If it took 13 billion years to get you then you’d be seeing light that originated 13 billion years ago. If you could see clearly, you’d be looking at what happened 13 billion years ago. By the time we see the MACS067-JD Galaxy, that galaxy might no longer exist.

Earth is about 4.543 billion years. Round that to 4.5 billion. Your astronomer is in the MACS0647-JD galaxy, the farthest galaxy known, which is actually about 13.3 billion light years away, so he’d see light arriving from around these parts from 13.3 billion years ago, before Earth existed, before our sun existed, and pretty much the beginnings of the Milky Way Galaxy, which itself is about 13.51 billion years old. Basically, he wouldn’t see much more than we see when we look at his galaxy. No sun, no Earth, and the Milky Way Galaxy just taking shape.

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