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
answers
flagUkraine
71%
4%
14%
9%
21
flagGermany
62%
8%
20%
8%
75
flagPoland
57%
12%
22%
7%
3030
flagthe United Kingdom
42%
28%
24%
4%
45
flagSwitzerland
40%
30%
10%
10%
10
flagAustralia
40%
30%
20%
0%
10
flagthe United States
39%
18%
31%
10%
58
flagIndia
25%
43%
15%
15%
32