I catch light that left its source before the Earth existed. I look outward but I also look backward through time. The bigger I am, the further back I can see. What am I?

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Accepted Answer

A Telescope. Light from distant galaxies takes billions of years to reach us. When a telescope captures that light, we are seeing the universe as it was billions of years ago. The most powerful telescopes look back to within a billion years of the Big Bang.

"I catch light that left its source before the Earth existed. I look outward but I also look backward through time. The bigger I am, the further back I can see. What am I?"

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