Question

C.
2.
Answer these questions:
1. Why were only five planets know earlier?
What did Copernicus believe?
3.
Why was Bruno burnt at the stake?
How does the movement of a planet depend on its distance from the Sun?
4.​

Answer 1

ANS 1

Five planets have been known since ancient times — Mercury, Venus, Mars, Jupiter, and Saturn. The first new planet discovered was Uranus. It was discovered by the English astronomer Sir William Herschel in 1781. Herschel was one of the first modern astronomers.

ANS 2

Nicolaus Copernicus was a Polish astronomer known as the father of modern astronomy. He was the first modern European scientist to propose that Earth and other planets revolve around the sun, or the Heliocentric Theory of the universe.

ANS 3

The radical Italian thinker was burned at the stake on February 17th, 1600. The trial of Giordano Bruno by the Roman Inquisition. Bronze relief by Ettore Ferrari, Campo de' Fiori, Rome.

ANS 4

The closer a planet is to the Sun, the stronger the Sun's gravitational pull on it, and the faster the planet moves. The farther it is from the Sun, the weaker the Sun's gravitational pull, and the slower it moves in its orbit.

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