# EVERYDAY SCIENCE

## SCIENCE

### EARTH SCIENCE

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Ptolemy and Copernicus were earth astronomers. Ptolemy believed that Earth was the center of the solar system and Copernicus believed that the Sun was the center of the solar system. Which model would the astronomers most likely use to support their beliefs?
 A Ptolemy and Copernicus would both use the geocentric model. B Ptolemy and Copernicus would both use the heliocentric model. C Ptolemy would use the geocentric model and Copernicus would use the heliocentric model. D Ptolemy would use the heliocentric model and Copernicus would use the geocentric model.
Explanation:

Detailed explanation-1: -Model of the universe Ptolemy placed the Earth at the centre of his geocentric model. Using the data he had, Ptolemy thought that the universe was a set of nested spheres surrounding the Earth. He believed that the Moon was orbiting on a sphere closest to the Earth, followed by Mercury, then Venus and then the Sun.

Detailed explanation-2: -In the 2nd century ad, Claudius Ptolemy of Alexandria suggested that this discrepancy could be resolved if it were assumed that the Earth was fixed in position, with the Sun and other bodies revolving around it. As a result, Ptolemy’s geocentric (Earth-centred) system dominated scientific thought for some 1, 400 years.

Detailed explanation-3: -Nicolaus Copernicus (1473–1543) was a mathematician and astronomer who proposed that the sun was stationary in the center of the universe and the earth revolved around it.

Detailed explanation-4: -Hicetas and Ecphantus, two Pythagoreans of the 5th century BC, and Heraclides Ponticus in the 4th century BC, believed that the Earth rotated on its axis but remained at the center of the universe.

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