Big Bang

A pigeon trap, on view at the Air and Space Museum, used by Nobel Prize winners Penzias and Wilson to remove the birds roosting in the radio antenna's large horn.

How Two Pigeons Helped Scientists Confirm the Big Bang Theory

For decades, astronomers had debated how the universe began. Then, in 1964, they had their "Eureka!" moment

An artist's rendition of the Big Bang.

What Astronomers Are Still Discovering About the Big Bang Theory

A half-century after it was confirmed, the theory still yields new secrets

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