It's a massive radio telescope reflecting the sun. See how the Effelsberg 100m RT looks from a satellite: https://www.google.com/maps/place/50%C2%B031'29.0%22

It's a massive radio telescope reflecting the sun. See how the Effelsberg 100m RT looks from a satellite: https://www.google.com/maps/place/50%C2%B031'29.0%22N+6%C2%B052'58.0%22E/@50.5246402,6.883749,499m/data=!3m1!1e3!4m2!3m1!1s0x0:0x0?hl=en https://www.google.com/maps/place/50%C2%B031'29.0%22N+6%C2%B...