What was the function of this colossal structure near Chernobyl?

radar
heavy water radiator
protective screen
graduation tower
Duga was a Soviet over-the-horizon radar system used as part of the Soviet anti-ballistic missile early-warning network. The system operated from July 1976 to December 1989. Two operational Duga radars were deployed, one near Chernobyl in the Ukraine and the other in eastern Siberia.
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radar
heavy water radiator
protective screen
graduation tower
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flagUkraine
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3%
20%
6%
29
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0%
20%
13%
15
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15%
12%
6%
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15%
5%
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9%
9%
11
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12%
22%
7%
4994
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15%
15%
12%
32
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10%
24%
9%
434
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45%
7%
35%
7%
42
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40%
20%
29%
9%
154
flagthe United Kingdom
39%
24%
29%
8%
100
flagAustralia
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24%
27%
6%
29
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45%
9%
11
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41%
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17
flagIndia
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12%
64
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36%
13%
22