What is 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
75%
6%
6%
12%
16
flagGermany
69%
5%
15%
10%
39
flagPoland
56%
12%
23%
7%
2292
flagthe United Kingdom
48%
24%
24%
3%
29
flagthe United States
39%
17%
31%
12%
41
flagIndia
33%
28%
19%
19%
21