does it have any replicas?
Yes, at least two vintage duplicates of Sputnik 1 exist, built apparently as backup units.
Sputnik 1
At least two vintage duplicates of Sputnik 1 exist, built apparently as backup units. 
who launched the first man made satellite and when The Soviet Union launched it into an elliptical low Earth orbit on 4 October 1957. who designed this satellite? Mikhail S. Khomyakov what was its launching mission? UNANSWERABLE
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Sputnik 1 [SEP] Backup units and replicas
At least two vintage duplicates of Sputnik 1 exist, built apparently as backup units. One resides just outside Moscow in the corporate museum of Energia, the modern descendant of Korolev's design bureau, where it is on display by appointment only. Another is in the Museum of Flight in Seattle, Washington. Unlike Energia's unit, it has no internal components, but it does have casings and molded fittings inside (as well as evidence of battery wear), which suggests it was built as more than just a model. Authenticated by the Memorial Museum of Cosmonautics in Moscow, the unit was auctioned in 2001 and purchased by an anonymous private buyer, who donated it to the museum.