The discovery of the cosmic microwave background was important because:. a. it established a firm center of the universe.
b. it was experimental verification of a prediction from the Big Bang theory.
c. its detection was a major advance in microwave testing.
d. it proved that astronomy at radio wavelengths was possible.
e. it showed the universe must be closed, with more than the critical density here.

strongest possible evidence that the universe expanded from an initial violent explosion

Explanation:

Their detection of the Cosmic Microwave Background (CMB), the radiation left over from the birth of the universe, provided the strongest possible evidence that the universe expanded from an initial violent explosion, known as The Big Bang

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