*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 (Astronomer and Geographer)
*The line used to define the boundary between the Earth’s atmosphere and outer space Karman Line (Line named after Theodore- Von-Karman)
*The astronomist known as ‘Law giver of the heavens’ 
Ans : Johannes Kepler
*The laws of planetary motion are discovered by
Ans : Johannes Kepler
*Chandrasekhar limit is a limiting mass below which a star becomes a white dwarf Chandrasekhar limit = 1.4 times the mass of the sun.
*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 was known as ‘Coloumbus of the space’ 
Ans : Yuri Gagarin
*The first woman in space 
Ans : Valentina Tereshkova (Russia, 1963) 
*The first American space traveller 
Ans : Alan Shepard
*The first American woman in space 
Ans : Sally K Ride
*The oldest man in space
Ans : John Glenn (77 years) [He died on December 8, 2016) 
*The first person to walk in space 
Ans : Alexi Leonov (USSR, 1965)
*The first woma..................
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