*The first artificial satellite in the world
Ans : Sputnik I (4th October 1957)  
*Sputnik I was launched by 
Ans : Russia 
*The first animal sent to space
Ans : The dog name ‘Leika’
*The first man in space
Ans : Yuri Gagarin (Russia)
*The spacecraft in which Yuri Gagarin travelled
Ans : Vostok - 1
*Yuri Gagarin went to space on
Ans : 12th April 1961
*The person who w..................
*The study of celestial bodies and the universe)
Ans : Astronomy
*Father of modern Astronomy 
Ans : Copernicus
*Heliocentric theory was put forward by 
Ans : Nicolaus Copernicus
*Solar system was discovered by
Ans : Nicolaus Copernicus
*Geocentric Theory of Earth was put forward by
Ans : Cladius Ptolemy (Astronomer&Astrologer)
*The first person to calculate the circumference of the Earth
Ans : Eratosthenes (Astrono..................
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