I have already tried searching about laika But one thing i am not able to find
What about remains of famous space dog laika? where are her remains? In space or fell back to earth?
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As @Uhoh answered in comments: *
The Wikipedia article about Laika says: "Over five months later, after 2,570 orbits, Sputnik 2—including Laika's remains—disintegrated during re-entry on 14 April 1958."
For basic historical questions like this, it's always worth looking at Wikipedia first, and then coming here if you cannot find the info you need.