Final answer:
Supernova data and galaxy clusters provide evidence that the cosmological constant is not equal to zero.
Explanation:
Supernova data and galaxy clusters provide evidence that the cosmological constant is not equal to zero. Supernova data show that the acceleration of the universe's expansion is not consistent with a zero cosmological constant, indicating that it is definitely positive. Additionally, the Sunyaev-Zel'dovich (SZ) effect observed in galaxy clusters supports the idea that the cosmological constant is not zero.
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