Astronomy Today Volume 2: Stars and Galaxies (9th Edition)
Astronomy Today Volume 2: Stars and Galaxies (9th Edition)
9th Edition
ISBN: 9780134566214
Author: Eric Chaisson, Steve McMillan
Publisher: PEARSON
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Chapter 2, Problem 2D
To determine

To explain: The geocentric model of the universe, and to determine the reason that it was accepted for so long.

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1. Why were the main reasons why the idea that the Earth was at the center of the universe lasted so long? 2. Discuss in 2 paragraphs the observations made by Galileo that disproved Geocentrism. Which one do you think was the most important? 3. Write down a hypothesis and observational experiment to test one of Newton’s laws of motion. EXPLAIN YOUR REASONING! 4. One of the first exoplanets discovered orbits the star 51 Pegasi with a period of just 4.2 days. 51 Pegasi is very similar to the Sun. Use Kepler’s laws to find the distance (in astronomical units) between the planet (unofficially named Bellerophon) and its star. SHOW YOUR WORK! 5.  How does halving the distance between two objects affect the gravitational force between them? 6. Suppose the Sun were somehow replaced by a star with five times as much mass. What would happen to the gravitational force between the Earth and the Sun? 7. How long would the Earth year last in this last case? (hint: Newton’s version of Kepler’s 3rd…
please don't reject, this is not about astronomy* How was it possible for the Copernican model of the universe to account for the complicated motion of the planets?
State and explain in 50 words possible applications of hyperbolic geometry EXCEPT of the following: - Geometry-based artwork - Neurological and biological studies - Promising model for social networks - Astronomy and cosmology - Illustrating Einstein’s theory of relativity
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