Foundations of Astronomy
13th Edition
ISBN: 9781305079151
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Textbook Question
Chapter 21, Problem 5P
The smallest detail visible through Earth-based telescopes is about 1 arc second in diameter. What linear size is this on the Moon? (Hint: Use the small-angle formula, Eq. 3-1.)
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Chapter 21 Solutions
Foundations of Astronomy
Ch. 21 - How does the force of gravity cause tidal coupling...Ch. 21 - As viewed from Earth, how many times does the Moon...Ch. 21 - If the Moon is tidally coupled to Earth, is Earth...Ch. 21 - How can you determine the relative ages of the...Ch. 21 - From looking at images of the Moons near side, how...Ch. 21 - Why did the first Apollo missions land on the...Ch. 21 - Why do planetary scientists hypothesize that the...Ch. 21 - Prob. 8RQCh. 21 - Prob. 9RQCh. 21 - Prob. 10RQ
Ch. 21 - What is the most significant kind of erosion that...Ch. 21 - Provide evidence to support a hypothesis about...Ch. 21 - What evidence can you cite that the Moon had...Ch. 21 - What evidence would you expect to find on the Moon...Ch. 21 - How does the large-impact hypothesis explain the...Ch. 21 - Look at the Celestial Profiles for Earth, the...Ch. 21 - Look at the Celestial Profiles for the Moon and...Ch. 21 - Prob. 18RQCh. 21 - Look at the Celestial Profiles for Earth, the...Ch. 21 - Look at the Celestial Profiles for the Moon and...Ch. 21 - Why are features like the Moons maria not observed...Ch. 21 - What are the relative ages of the intercrater...Ch. 21 - What evidence can you give that Mercury has a...Ch. 21 - Why is it not surprising that there is no evidence...Ch. 21 - What evidence can you give that Mercury had...Ch. 21 - How are the histories of the Moon and Mercury...Ch. 21 - What property of the Moon and Mercury has resulted...Ch. 21 - Prob. 28RQCh. 21 - Prob. 1DQCh. 21 - Prob. 2DQCh. 21 - Prob. 3DQCh. 21 - Prob. 4DQCh. 21 - Look at the right top and bottom images in Figure...Ch. 21 - Calculate the escape velocity of the Moon from its...Ch. 21 - Prob. 3PCh. 21 - Why do small planets cool faster than large...Ch. 21 - The smallest detail visible through Earth-based...Ch. 21 - Prob. 6PCh. 21 - The trenches where Earths seafloor slips downward...Ch. 21 - An Apollo command module orbited the Moon about...Ch. 21 - Prob. 9PCh. 21 - What is the angular diameter of Mercury when it is...Ch. 21 - If you transmit radio signals to Mercury when...Ch. 21 - What is the wavelength of the most intense...Ch. 21 - Suppose you send a probe to land on Mercury, and...Ch. 21 - The smallest detail visible through Earth-based...Ch. 21 - Look at the image of the astronaut on the Moon at...Ch. 21 - Examine the shape of the horizon at the Apollo 17...Ch. 21 - In the photo shown here, astronaut Alan Bean works...
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- Again using Appendix F, which planets might you expect to have extreme seasons? Whyarrow_forwardWhat is the maximum angular diameter of the dwarf planet Ceres when it is closest to Earth? Could Earth-based telescopes detect surface features? Could the Hubble Space Telescope? (Hint: Use the small-angle formula, Eq. 3-1.) (Notes: Ceress average distance from the Sun is 2.8 AU and its diameter is 950 km. The best angular resolution of Earth-based telescopes at visual wavelengths is about 1 arc second and of Hubble about 0.1 arc second.)arrow_forwardWhat is the angular diameter of Mercury when it is closest to Earth? How does that compare with the angular diameter of the Moon? (Hint: Use the small-angle formula, Eq. 3-1.) (Note: Relevant information can be found in the Celestial Profiles for the Moon and Mercury and Appendix Table A-10.)arrow_forward
- At an average opposition, the Earth and Mars are separated by 0.52 AU. Suppose an astronomer observes Mars at opposition and that seeing blurs the images to a resolution of 1.0 seconds of arc. What is the smallest surface feature the astronomer would be able to resolve on Mars? How does this size compare with the diameter of Mars?arrow_forwardVenus can be as bright as apparent magnitude -4.7 when at a distance of about 1 AU. How many times fainter would Venus look from a distance of 5 pc? Assume Venus has the same illumination phase from your new vantage point. (Hints: Recall the inverse square law; also, review the definition of apparent visual magnitudes. ote: 1 pc = 2.1 x 10° AU). times fainter What would its apparent magnitude be? Need Help? Read Itarrow_forwardThe smallest detail visible through a Earth-based telescope is about 1.00 arcsecond in diameter. Use the small angle formula to determine to the right number of significant figures the size of the object in meters this would represent on Mars as it is at the closest distance from Earth. (??????? ???????? (arc−seconds)2.06×105=?????? ??????????????? ; ???−????????????−????=5.46×105 ??).arrow_forward
- d. Diameter of the Sun I h A d. Standing on the beach at sunset, you extend the tip of your finger at your full arm length from your face, covering the Sun. Upon moving your finger around, you find that only about half of its width is needed to completely cover the Sun's diameter. You measure your finger width to be 0.5 inches. You know your arm length to be 28.0 inches. You have be told that the Sun is approximately 93 million miles away. Use this information to determine the approximate diameter of the Sun, filling in the table below with the proper quantities measure in meters. 1 = ½ finger g = eye level height d = object h = Diameter f= object height from level to top of eye level X = Arm A = angle width length distance from eye of the Sun objectarrow_forwardVenus can be as bright as apparent magnitude −4.7 when at a distance of about 1 AU. How many times fainter would Venus look from a distance of 7 pc? Assume Venus has the same illumination phase from your new vantage point. (Hints: Recall the inverse square law; also, review the definition of apparent visual magnitudes. Note: 1 pc = 2.1 ✕ 105 AU). [fill in the blank] times fainter What would its apparent magnitude be?arrow_forwardThe diameter of the Moon is 3500 km. On Figure 2 it is scaled down to 13.2 cm. What is the diameter of Mare Serenitatis, since on Figure 2 it is 2.2 cm? (Show your calculation)arrow_forward
- 6arrow_forwardThe unaided human eye has a resolution of about 100 arc seconds in bright lighting conditions. Could someone looking out the command module window have seen the astronauts on the Moon yes or no?arrow_forwardPure, solid water ice has an albedo A≈0.35. What is the minimum distance from the Sun at which a rapidly rotating ice cube would remain frozen? Between which two planets does this distance lie?arrow_forward
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