SPUTNIK

Soviet satellite, launched 1957 (7)

Solution has appeared in 3 crosswords (2 across and 1 down):

• Quick crossword No 15,997 — 2021-08-13 23:00:22
  14A: First Soviet earth satellite, 1957 (7)
• Quick crossword No 15,907 — 2021-04-30 23:00:47
  10A: First artificial Earth satellite, orbiting from October 1957 to January 1958 (7)
• Quick crossword No 15,576 — 2020-04-08 23:00:29
  16D: Soviet satellite, launched 1957 (7)