4. If the mean distance of a planet from sun is 4 times the mean distance of earth from sun, then how many years does that planet take to move once around the sun?
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Answers
Answer:
The answer is
Explanation:
Until less than 500 years ago, most people thought Earth was the center of the solar system. By the time Johannes Kepler was born in 1571, people were starting to get the idea that the planets revolve around the Sun. Kepler was the first to explain the puzzling movements of the planets by realizing that their orbits around the Sun are not perfect circles, but instead are ellipses, like elongated circles. Kepler discovered that the motions of the planets could be described very accurately by some simple mathematical formulas. The closer a planet is to the Sun, the faster it travels, and Kepler found a method to connect the average distance of a planet from the Sun to the time it takes the planet to make a complete orbit around the Sun.
Planetary orbits.
Kepler's discoveries allowed him to figure out how much closer or farther all the planets are to the Sun than Earth is, even though he could not figure out the actual distances. For example, he knew Mars is closer than Saturn, because one Mars orbit takes less than 2 years, while one Saturn orbit takes about 29 years. Although he couldn't use that to calculate their real distances, he did figure out that Mars is about 1.5 times farther from the Sun than Earth is, and Saturn is 10 times farther away than the Sun.
Answer:
8 earth day.
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