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Why were astronomers interested in studying radio waves in the 1980s and 1990s?

Why were astronomers interested in studying radio waves in the 1980s and 1990s?-example-1

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8 votes

Answer:

c

Step-by-step explanation:

User Chung Nguyen
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13 votes

Answer:

The 3rd one

Step-by-step explanation:

User MegZo
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