The Bigger Picture

The universe stretches for unimaginable distances in every direction—perhaps to infinity itself. From our point of view on Earth, we are at the center of an "observable universe" with a 13.7-billion-light-year radius (a light-year is itself 5.9 trillion miles/9.5 trillion km). Light from objects farther away has simply not had time to reach us since the universe was created.

But the universe stretches even farther beyond our observable limits. Observers on a planet 13.7 billion light-years from Earth would have their own unknown to us, and so on. There is certainly no recognizable "edge"—there

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