Home›Articles›How a simple radio sphere replaced Object DArticleHow a simple radio sphere replaced Object DArticlesConnectionsSourcesComments (0)Reader Challenges (0)ConnectionsArticle OnSputnik 1, Spacecraft Well-attested SourcesWikipedia: Sputnik 1tier 2Wikimedia FoundationBefore the launch: Satellite construction projectQuote, Before the launch: Satellite construction projectFearing the U.S. would launch a satellite before the USSR, OKB-1 suggested the creation and launch of a satellite in April-May 1957, before the IGY began in July 1957.View the SourceAtlas Article VocabularyComments (0)No comments yet. Be the first to share a thought.Sign in to join the discussion.Reader Challenges (0)No disputes yet. Spotted an error or a better source? Open the first one.Sign in to dispute this or suggest a correction.