Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 1, Problem 18Q
To determine
The diameter of the Moon in kilometers (km), given that the distance between Earth and Moon is 384000 km and the angle subtended by Moon is
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From Earth, the angular size of the Moon is 0.5 degree. The distance between the Earth and the Moon is 384,400 km. Use the small-angle formula to find the size of the Moon. Compare the number to the distance of the Moon given previously. It is consistent?
Neptune is an average distance of 4.5×10^9 km from the Sun.
- How many astronomical units (AU) is Neptune from the Sun? One AU is 1.50×10^8 km.
- Estimate the length of the Neptunian year using your answer from part (a).
Assuming that the orbital period of Mars is 687 days, and that the first day of the Martian winter in its Northern Hemisphere is December 21 (Earth date), when will the vernal equinox, summer solstice and autumnal equinox be (according to Earth’s calendar)? Explain your reasoning clearly.
Chapter 1 Solutions
Universe
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- What is the angular diameter of the Moon in the third-quarter phase? What is the shortest/longest angular distance from the horizon to the Moon in the third-quarter phase when the time is midnight or noon?arrow_forwardThe radius of Mars is about 3400 km, and its moons Phobos and Deimos orbit 9600 km and 23,500 km from the center of the planet. Design a model in which Mars is 5 in. in radius. How far away from the center of the planet would the two moons orbit?arrow_forwardWhat is the angular diameter of Jupiter as seen from Callisto? From Amalthea? Relevant data can be found in Celestial Profile 7 and Appendix Table A-11. (Hint: Use the small-angle formula in Reasoning with Numbers 3-1.)arrow_forward
- Seasons are a result of the inclination of a planet’s axial tilt being inclined from the normal of the planet’s orbital plane. For example, Earth has an axis tilt of 23.4° (Appendix F). Using information about just the inclination alone, which planets might you expect to have seasonal cycles similar to Earth, although different in duration because orbital periods around the Sun are different?arrow_forwardLook at Appendix F and Appendix G and indicate the moon with a diameter that is the largest fraction of the diameter of the planet or dwarf planet it orbits.arrow_forwardExplain in detail why and how we see the Moon go through phases. What one phase of the Moon could not happen if the phases were actually caused by the Earth’s shadow?arrow_forward
- From the data measured read off the period, P and the orbital radius, a from thegraph for the moon Ganymede . These values will have units of hours for the period P, and Jupiter Diameters (J.D.) for a. Enter your results here:P (period) = _________ hours a (orbital radius) = ________ J.D. After,In order to use Kepler's Third Law, you need to convert the period into years, using: 1 day = 24 hours and 1 year = 365.25 days. The orbital radius must be converted to A.U., using 1050 J.D. = 1 A.U. Enter your converted values here: P (period) = _________ years a (orbital radius) = ________ A.U.arrow_forward1. The diameter of the Sun is equal to 1.392*10^9 m, and the distance from the Sun to Saturnis equal to 9.5 AU. Suppose you want to build an exact scale model of the solar system,and you are using a volleyball with average diameter of 21 cm to represent the Sun. a) In your scale model, how far away would Saturn be from the Sun? Give your answer inmeters.b) The actual diameter of Saturn is 116,460 km. What would be Saturn’s diameter in yourscale model? Give your answer in centimeters.arrow_forwardWhich planet should I start with? USE IMAGE AS REFERNCEarrow_forward
- Explain what do you mean by lunar gravity?arrow_forwardDuring the first and third quarter moon phases, there isn’t much difference between the ocean level during high tide and low tide. What is the name of the tide that occurs during three moon phases? Why is it smaller than tides at other than tided at other times in the lunar cycle?arrow_forwardWhat fraction of the Moons surface area is the far side? Of the near side of a third-quarter moon, what fraction is dark? What fraction of the far side is in the dark that cannot be seen by an observer from Earth viewing the Moon in its third-quarter phase?arrow_forward
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