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What source of data leads us to believe that the cosmological constant is not equal to...

What source of data leads us to believe that the cosmological constant is not equal to zero?

A. Cepheid variable stars

B. supernovas

C. galaxy clusters

D. cosmic microwave background

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Ans- (B) Supernovas

Supernovas data leads us to believe that the cosmological constant is not equal to zero.

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