Polish scientist who wrote on the revolutions of the heavenly spheres a) johannes kelper b) nicolaus copernicus c) galileo galilei d) isaac newton a b c d

Nicolaus Copernicus wrote on the Revolutions of the Heavenly Spheres .

Option B

Explanation:

It was in the 16th century when the entire world believed that the centre of the universe is earth; Copernicus proposed that all the planets are revolving around the sun. This was revolutionary shift from the then Ptolemaic model of cosmos to heliocentric model in which sun is considered to be at the centre and not earth.

He had also mentioned in his work that the phenomenon of day and night is caused by the earth’s rotation and change in the seasons is triggered by the revolution of our planet around the sun. His work became the corner stone for the scientists and astronomers.

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.

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