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Ask the Astronomer

Dennis Cheung asks:

What evidence is there for the Big Bang?

Astronomer William Georgevich replies:

The most overwhelming evidence for the Big Bang comes from measurements made over 30 years ago of the background radiation of the Universe.

The Universe is uniformly about 4 degrees above Absolute Zero. If the Universe is cooling as this incontrovertible evidence demonstrates, then there must have been an original explosion or expansion from which the Universe is still cooling.

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