Sputnik was the first unmanned satellite launched into orbit in 1957.During which decade were manned satellites first sent into orbit?

Sputnik was launched in 1957, but it carried no people. The first human spaceflight was Yuri Gagarin’s orbital flight aboard Vostok 1 in 1961, so crewed spacecraft first reached orbit in the 1960s. Therefore, the correct choice is 1960s.

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