Historical clue formulations

• "Fellow traveler," in Russian — 2025-11-21
• Soviet satellite launched in 1957 — 2022-09-21
• Big launch of 1957 — 2020-05-24
• News sensation of 10/4/1957 — 2016-01-31
• Subject of the book "Red Moon Rising" — 2012-08-24
• Traveler in 1957 news — 2012-06-22
• Subject of the 2001 book subtitled "The Shock of the Century" — 2011-09-30
• Newsmaker of October 4, 1957 — 2007-10-04
• Literally, "traveling companion" — 1999-02-26