What urged Shri Venkatesh B. Ketkar to propose the existence of more planets outside Neptune’s orbit?
A. He observed them through a telescope
B. He knew astrology which predicted existence of unknown objects
C. He made mathematical calculations based on gravitational pull of orbit of Neptune
D. He was informed about such planets by French scientists
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Shri Venkatesh B. Ketkar proposed the existence of more planets outside Neptune’s orbit - Option (C) after making mathematical calculations based on the gravitational pull of the orbit of Neptune
Explanation:
- V.B Ketkar taught himself higher mathematics because neither the University of Mumbai nor the University of Madras offered it. He enlisted the help of renowned American mathematician and astrophysicist Simon Newcomb, as well as his individual hard work.
- He studied spherical geometry, algebra, trigonometry, statistical analysis, and other sophisticated mathematics, as well as Newton's 'Principia Mathematica.'
- He got so adept in mathematics by combining hard labor and acute intelligence that he authored a complete treatise on astronomy at the age of thirty-one.
- He anticipated the calculations representing the position of the ninth planet's orbit, which were once again more accurate than those confirmed later.
- In addition, he proposed names for these two planets. He gave the Ninth Planet the name 'Brahma,' (Neptune) and the Tenth Planet (Pluto) the name 'Vishnu.'
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