Which heavenly body was discovered by astronomer Clyde W Tombaugh on 18 February 1930?

Question

On 13th March 1781 a heavenly body was observed, announced and named Georgium Sidus, a star; it was not the first time the star had been observed. Eventually it became known as what?

Answer 1

Answer: Pluto
Pluto was originally considered the ninth planet in the solar system, but recent greater knowledge of the larger bodies in the outer solar system where Pluto lies has led to its being re-classified from 2005 onwards as a dwarf planet.