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Geography, 30.11.2019 04:31 nakeytrag

The first confirmed detections of extrasolar planets occurred in
a. 2009
b. the mid-20th century
c. the 1990s
d. the mid-17th century

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Answers: 1

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The first confirmed detections of extrasolar planets occurred in
a. 2009
b. the mid-2...
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