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Biology, 16.04.2021 16:20 brandiwingard

Which observational tool helped astronomers Arno Penzias and Robert Wilson discover the existence of the cosmic microwave background (CMB)? A.
optical telescope
B.
radio telescope
C.
a digital camera
D.
space telescope

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Which observational tool helped astronomers Arno Penzias and Robert Wilson discover the existence of...

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