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10 Earth science question.

Date Posted: 01/05/2019
Category: Science
Due Date: 02/05/2019
Instruction
1. How is light year defined? What does the Astronomical Unit (AU) stand for? 2. How was the retrograde motion of certain planets in the solar system (observed from the Earth) explained by ancient Greeks and modern astronomers respectively? 3. Who first proposed that the sun is located in the center of the solar system? What is the major difference between his theory and the one we have today in modern astronomy? 4. Which of the Kepler’s laws explains that all the planets move around the Sun in variable speeds? 5. Based on Kepler’s 3rd law, if the distance between an unknown planet in the solar system and the Sun is 1200 million kilometers, how long does it take for this planet to complete its revolution around the Sun? 6. Use an example to explain how Galileo proved that the Sun must be in the center of the solar system based on his observation. 7. What is the single most important assumption based on which the 88 Constellations were established? 8. Why can observers from the Earth’s surface only see one half side of the Moon? 9. When is the approximate time during a day to see a third quarter phase moon? 10. Given the fact that a lunar eclipse occurs when the moon is positioned at its full-moon phase and the moon is at its full-moon position 12 times during a year, how come lunar eclipse does not occur 12 times a year?
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