Q17 of 50 Page 17

Name the planet that was predicted before it was actually observed. 

Neptune-U.J. Levessier predicted the existence of planet, called neputne, beyond Uranus in 1846 that was later observed.

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15 Which planet of the solar system is (a) largest and (b) smallest in size? 16  Name the planets that were known to ancient astronomers. 18 What are planets? How is a planet different from a star? 19 State the physical conditions of different planets.