Astronomy Today (9th Edition)
9th Edition
ISBN: 9780134450278
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…
Explain the geocentric view of the universe.
Briefly explain your answer.
Chapter 2 Solutions
Astronomy Today (9th Edition)
Ch. 2 - Prob. 1DCh. 2 - Prob. 2DCh. 2 - Prob. 3DCh. 2 - Prob. 4DCh. 2 - Prob. 5DCh. 2 - Prob. 6DCh. 2 - Prob. 7DCh. 2 - Prob. 8DCh. 2 - Prob. 9DCh. 2 - Prob. 10D
Ch. 2 - Prob. 11DCh. 2 - Prob. 12DCh. 2 - Prob. 13DCh. 2 - Prob. 14DCh. 2 - Prob. 15DCh. 2 - Prob. 1MCCh. 2 - Prob. 2MCCh. 2 - Prob. 3MCCh. 2 - Prob. 4MCCh. 2 - Prob. 5MCCh. 2 - Prob. 6MCCh. 2 - Prob. 7MCCh. 2 - Prob. 8MCCh. 2 - Prob. 9MCCh. 2 - Prob. 10MCCh. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - Prob. 6PCh. 2 - Prob. 7PCh. 2 - Prob. 8P
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- How Do We Know? Why is it important that a theory make testable predictions?arrow_forwardAnswer it correctly please. Explain your answer. I will rate accordingly with multiple votes.arrow_forwardIN NOT MORE THAN 300 WORDS describe the ancient idea about the position of the earth relative to the other heavenly bodies. Explain why it was reasonable for them to believe that the earth was the center of the universe.arrow_forward
- 1. If people on Earth were viewing a total lunar eclipse, what would you see from your home on the Moon? Draw a diagram. 2. Why were the main reasons why the idea that the Earth was at the center of the universe lasted so long? 3. Discuss in 2 paragraphs the observations made by Galileo that disproved Geocentrism. Which one do you think was the most important? 4. Write down a hypothesis and observational experiment to test one of Newton’s laws of motion. EXPLAIN YOUR REASONING! 5. 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! 6. How does halving the distance between two objects affect the gravitational force between them? 7. Suppose the Sun were somehow replaced by a star with five times as much mass. What would happen to the gravitational force between…arrow_forwardMatch each discovery, model, or Law with the person we credit with discovering them (Select T-Tycho Brahe, K-Kepler, G-Galileo, A-Aristotle, P-Ptolemy, N-Newton If the first is T and the rest K, enter TKKKKK) A) Devised the earliest geocentric solar system models B) The orbits of planets are C) Made careful measurements of the location of the planets good to 1 arcmin. D) Described the meaning of force by three laws. E) Devised the best Earth-centered (geocentric) model of the solar system using epicycles F) Found the Sun had flaws (sun spots) and that the Sun rotates. elipsesarrow_forwardPLEASE MAKE SURE THAT YOU ARE ANSWERING THE QUESTIONS USING YOUR OWN THOUGHTS. STRICTLY NO COPY PASTE PLEASE! Answer each questions in not less than 2 paragraphs: 3. What is astronomy? 4. What is Geocentric Model?arrow_forward
- Answer all questions in the space provided. Show ALL your steps in your calculations. Answer in complete sentences and therefore statements.arrow_forwardMilestone A: Walk 3.2 km (~2 miles) towards northeast. Milestone B: Walk 1.3 km towards southeast. Milestone C: Walk 2.4 km directly south. Surprise at the end! You have arrived at the treasure! Distance: What is the total distance traveled if you walk the distance A, B, C? Give your answer in km and miles. 2. Direction: a. what is meant by “north east?” b. what direction would this be on a cartesian coordinate system? c. What is meant by “south east?” d. What direction would this be on a cartesian coordinate system? e. What about “south”? f. What direction on cartesian coordinate system? 3. Draw the diagram: include drawing the resultant a. What does the resultant vector represent? 4. Calculate: use trigonometry to find the displacement.arrow_forwardExplain what is meant by the distance ladder in astronomy. Describe briefly how each “rung” of the distance ladder is calibrated so that a reliable measure of distance can be obtained using each of the methods. State clearly the range of distances that can be measured by each method that makes up the distance ladder.arrow_forward
- Illustrate the Models of the Universe 1. Heliocentric System with circular orbits 2. Geocentric system with circular orbits 3. Heliocentric system with elliptical orbits 4. Geocentric system with circular orbitsarrow_forwardAnswer it correctly please. Explain your answer. I will rate accordingly with multiple votes. Ty-ped answer please.arrow_forwardUse the circumference and speed to figure out how long the Sun takes to go once around the Galaxy (the Sun's period, sometimes called the "galactic year.") Give your answer in Earth years. Be careful with your units.arrow_forward
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