Question

who is the first in whole world to stay for longest duration in space​

Answer 1

Explanation:

Valery Polyakov

Russian cosmonaut Valery Polyakov spent nearly 438 consecutive days aboard the Mir space station, from January 1994 to March 1995. He therefore holds the record for longest single human spaceflight — and perhaps set another one for wobbliest legs when he finally touched down.

Answer 2

Explanation:

cosmonaut Valery Polyakov

The world record for the single longest mission by any space explorer, man or woman, is held by cosmonaut Valery Polyakov, who spent 438 consecutive days on board Russia's former space station Mir from January 1994 to March 1995.