Who was the scientist who discovered sputnik?

Why did people think it was hoax moon landing? What would you expect the temperature to be at a height of 500 meters up the mountain? What type of energy enters the Earth's atmosphere from the sun? What are Io and Ganymede and Amalthea? What do scientists send on the International Space Station to test the effects of microgravity? What star classification is given to the sun? What is the relationship between Demeter and Persephone? What is the difference between the aneroid barometer and a mercury barometer? What was Robert Falcon Scott trying to do in his South Pole expeditions? What is a planet dry and hot? Why do you keep waking up at 333 am? What does it mean for a planet to revolve around the sun? Which phase of the Moon follows the waxing crescent phase? What is the crack in Doctor Who? Use asteroid in a sentence? Why does the space shuttle track on the surface of the earth in a serpentine configuration? What do you call the moon when its growing smaller? How large is our entire galaxy? What happend on Apollo 13? Where are the eyes of Albert Einstein?

Who was the scientist who discovered sputnik?