Homework 1 ASTR
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University of Illinois, Urbana Champaign *
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Course
100
Subject
Astronomy
Date
Apr 3, 2024
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9
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1/30/24, 10:15 PM Started on State Completed on Time taken Points Grade Feedback Question 1 Correct 1.00 points out of 1.00 Homework 1: Attempt review | Learn@Illinois Tuesday, January 23, 2024, 5:59 PM Finished Tuesday, January 23, 2024, 6:02 PM 3 mins 15 secs 34.00/34.00 25.00 out of 25.00 (100%) Excellent job! The nightly motion of objects across our the sky is caused by the Select one: a. revolution of Earth around the Sun. b. rotation of the whole celestial sphere of stars around the fixed Earth. c. rotation of Earth on its axis. ¥ Correct! d. motion of the solar system around the galaxy. https://learn.illinois.edu/mod/quiz/review.php?attempt=32225175&cmid=8198765 118 1/30/24, 10:15 PM Question 2 Correct 1.00 points out of 1.00 The diagram below illustrates the geometry of lunar phases with the moon shown in 8 positions in its orbit. Which numbered position with a new moon? Select one: a. 1 b. 2 c 3 4 e. 5« Correct! https://learn.illinois.edu/mod/qui Homework 1: Attempt review | Learn@Illinois - (‘_ <y 2 ) o Show Answer /review.php?attempt=322251758cmid=8198765 2/18
1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois Question 3 Correct 1.00 points out of 1.00 At approximately what time does the waning gibbous moon rise? w Sunlight JILLldid WOW Answer Select one: a. 3pm b. 6pm ¢ 9pm+« Correct! d. midnight e. 3am Question 4 Correct 1.00 points out of 1.00 In what region of Earth would you have to be to have the Sun pass through your zenith at some time during the year? Select one: a. within the Arctic Circle or Antarctic Circle b. at any latitude - at noon every day c. within +/- 23.5° of the equator (i.e., in the tropics) ¥ Correct! d. only on the equator, nowhere else https://learn.illinois.edu/mod/quiz/review.php?attempt=32225175&cmid=8198765 1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois Question 5 Correct 1.00 points out of 1.00 What is the primary cause of Earth's seasons? Select one: a. The orbit of Earth is an ellipse, so Earth is not always the same distance from the Sun. b. Earth's rotation axis is tilted with respect to the plane of its orbit around the Sun. # Correct! ¢. Earth's rotation axis precesses (wobbles). d. Earth moves faster during parts of its orbit around the Sun and more slowly during other parts. Question 6 Correct 1.00 points out of 1.00 The ____is the point on the celestial sphere directly above any observer. Select one: a. north celestial pole b. south celestial pole ¢. celestial equator zenith « Correct! e. asterism Question 7 Correct 1.00 points out of 1.00 Which of the following statements correctly describes the relationship between stars and constellations? Select one: a. Only those stars that were visible to the ancient Greeks are located in constellations. b. Only the brighter stars are in constellations. ¢. Only stars within the zodiac close to the ecliptic, Earth's orbital plane, are located in constellations. Every star is located in a constellation. ¥ Correct! 3/18 https://learn.illinois.edu/mod/quiz/review.php?attempt=32225175&cmid=8198765 418
1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois Question 8 Correct 1.00 points out of 1.00 In the picture below, the phase of the moon is ... Select one: a. waning gibbous b. half moon c. waxing crescent o first quarter e. third quarter ¥ Correct! Question 9 Correct 1.00 points out of 1.00 When the northern hemisphere is experiencing winter Select one: a. Earth is closer to the Sun than it is during northern summer. ¢+ Correct! b. Earth is farther from the Sun than it is during the northern summer. c. Earth is the same distance from the Sun as it is the rest of the year because Earth's orbit is circular with the Sun in the center. d. the southern hemisphere is experiencing winter also. https://learn.illinois.edu/mod/quiz/review.php?attempt=32225175&cmid=8198765 1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois Question 10 Correct 1.00 points out of 1.00 If tonight the phase of the moon is full when it rises, what will be the phase 4 days from now? Select one: a. full b. waning gibbous « Correct! c. third quarter d. waxing gibbous €. new Question 11 Correct 1.00 points out of 1.00 If tonight the phase of the moon is full when it rises, what will be the phase when the moon sets? Select one: a. full« Correct! b. waning gibbous c. third quarter waxing gibbous €. nhew Question 12 Correct 1.00 points out of 1.00 If the nearest star is 4.2 light-years away, then Select one: a. the staris 4.2 million AU away. b. the light we see left the star 4.2 years ago. ¥ Correct! c. the star must have formed 4.2 billion years ago. d. the star must be very young. e. the star must be very old. 5/18 https://learn.illinois.edu/mod/quiz/review.php?attempt=32225175&cmid=8198765 6/18
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1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois Question 13 Correct 1.00 points out of 1.00 The phase of the Moon at the time of solar eclipse is Select one: a. third quarter. b. any phase; new, quarter, or full. full. d. new.v Correct! n Question 14 Correct 1.00 points out of 1.00 A solar eclipse occurs on Earth when the Select one: a. Sun passes in front of the Moon. b. Moon passes behind the Sun. c. Moon casts a shadow on Earth. « Correct! d. Earth casts a shadow on the Moon. https://learn.illinois.edu/mod/quiz/review.php?attempt=32225175&cmid=8198765 1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois Question 15 Correct 1.00 points out of 1.00 At approximately what time does the waxing gibbous moon set? g Sunlight VIdIlldd Show Answer Select one: a. 3pm b. 6 pm c. 9pm midnight e. 3am« Correct! Question 16 Correct 1.00 points out of 1.00 Orion is visible on winter evenings but not summer evenings because of Select one: a. the location of Earth in its orbit. ¥ Correct! b. the tilt of Earth's axis. c. interference from the full moon. d. the orbit of the Solar System through the Galaxy. 718 https://learn.illinois.edu/mod/quiz/review.php?attempt=32225175&cmid=8198765 8/18
1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois 1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois Question 17 Question 19 Correct Correct 1.00 points out of 1.00 1.00 points out of 1.00 The diagram below illustrates the geometry of lunar phases with the moon shown in 8 positions in its orbit. Which numbered position with a An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration depicts the photograph taken waning gibbous moon? by the observer, which direction was the camera pointing? Star Trails Horizon Select one: 404 Ettor Sunlight o straight north «# Correct! b. straight east Select one: ¢. straight south a. 1+ Correct! d. straight west b, 2 e. straight up, directly overhead c. 3 d 4 e. 5 Question 18 Correct 1.00 points out of 1.00 If an observer on Earth sees the Moon to be full, than at the same time an observer on the Moon would see Earth to be at what phase? You may want to sketch a diagram to work this out. Select one: a. full b. new« Correct! c. third quarter d. Earth does not appear to go through phases when observed from the Moon. https://learn.illinois.edu/mod/quiz/review.php?attempt=322251758&cmid=8198765 9/18 https://learn.illinois.edu/mod/quiz/review.php?attempt=322251758cmid=8198765 10/18
1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois 1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois Question 20 Question 21 Correct Correct 1.00 points out of 1.00 1.00 points out of 1.00 The diagram below illustrates the geometry of lunar phases with the moon shown in 8 positions in its orbit. Which numbered position with a The diagram below illustrates the geometry of lunar phases with the moon shown in 8 positions in its orbit. Which numbered position with a first quarter moon? waxing crescent moon? Sunlight S ddbdd ded Sunlight =2 - —> =2 R Select one: a. 1 Select one: b. 2 c. 3« Correct! a. 1 b. 2 d 4 c. 3« Correct! e. 5 d 4 e. 5 Question 22 Correct 1.00 points out of 1.00 Which of the following parameters will dictate whether a particular solar eclipse appears as a total or an annular eclipse to an observer? Select one: a. the distance of the Moon from Earth at the time of eclipse « Correct! b. the distance of Earth from the Sun at the time of eclipse c. the phase of the Moon (whether it is new, quarter, or full) d. the time of day or night https://learn.illinois.edu/mod/quiz/review.php?attempt=32225175&cmid=8198765 11/18 https://learn.illinois.edu/mod/quiz/review.php?attempt=32225175&cmid=8198765 12/18
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1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois Question 23 Correct 1.00 points out of 1.00 A lunar eclipse does not occur at every full moon because Select one: a. alunar eclipse cannot occur after sunset. b. the orbit of the Moon is not a perfect circle. c. the plane of the Moon's orbit is at an angle to the plane of Earth's orbit. ¥ Correct! d. the path of the Sun is inclined at an angle of 5° to the ecliptic. Question 24 Correct 1.00 points out of 1.00 A person standing in the Moon's penumbra will see a Select one: a. partial solar eclipse. Correct! b. partial lunar eclipse. c. total solar eclipse. d. total lunar eclipse. Question 25 Correct 1.00 points out of 1.00 One astronomical unit, or one AU is defined as the Select one: a. distance traveled by light in one year. b. average distance between the Sun and Earth. ¥ Correct! c. distance from which Earth-Sun distance will subtend an angle of one arcsecond. d. distance traveled by light in one second. https://learn.illinois.edu/mod/quiz/review.php?attempt=32225175&cmid=8198765 13/18 1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois Question 26 Correct 1.00 points out of 1.00 At which time of the year in Urbana, IL will your shadow in sunlight at midday be shortest? Select one: a. midwinter, or early January b. midsummer, or about August 5 c. the first day of summer, or about June 21 « Correct! d. the first day of spring, or about March 21 Question 27 Correct 1.00 points out of 1.00 Which of the following phases of the Moon is most easily seen during the daytime (mid-morning or mid-afternoon, not near sunrise or sunset)? Select one: a. The Moon is never visible in daylight. b. new c. full quarter ¥ Correct! https://learn.illinois.edu/mod/quiz/review.php?attempt=32225175&cmid=8198765 14/18
1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois 1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois Question 28 Question 30 Correct Correct 1.00 points out of 1.00 1.00 points out of 1.00 At approximately what time is the waxing crescent moon highest in the sky? In the picture below, the phase of the moon is ... w Sunlight AL LLLLd Select one: a. waxing gibbous ¥ Correct! b. waxing crescent c. full Show Answer d. third quarter e. waning gibbous Select one: a. 3am b. 6am Question 31 c. 9am Correct d. noon 1.00 points out of 1.00 e. 3pm+« Correct! Where on Earth would you have to be to observe a particular partial solar eclipse? Question 29 Select one: Correct a. within 3000 km of Earth's equator 1.00 points out of 1.00 b. within a narrow and specific strip of Earth's surface less than 6000 km wide + Correct! ¢. on the dark side of Earth Astronomers sometimes announce they have discovered a new solar system beyond our own, or a new galaxy beyond our own. Which choice d. always within 23.5° of the equator (i.e., in the tropics) correctly describes the terms "solar system" and "galaxy"? Select one: a. A solar system is a large assemblage of stars similar to the Sun, whereas a galaxy is much larger and consists of all different types of stars. b. A solar system consists of an immense number of stars (i.e,, suns), and a galaxy is a cluster of many such systems. c. A galaxy consists of planets and other objects orbiting around a single star, whereas a solar system is a system consisting of an immense number of stars (i.e., suns). d. A solar system consists of planets and other objects orbiting around a star, whereas a galaxy is a system consisting of « Correct! an immense number of stars. https://learn.illinois.edu/mod/quiz/review.php?attempt=322251758&cmid=8198765 15/18 https://learn.illinois.edu/mod/quiz/review.php?attempt=322251758cmid=8198765 16/18
1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois Question 32 Correct 1.00 points out of 1.00 In the picture below, the phase of the moon is ... Select one: a. hew moon b. waning crescent ¥ Correct! c. waxing crescent d. waxing gibbous e. chesire moon Question 33 Correct 1.00 points out of 1.00 What type of lunar eclipse would be seen by observers on the night side of the Earth in the diagram below? Select one: a. total lunar eclipse b. partial lunar eclipse ¥ Correct! ¢. penumbral lunar eclipse d. no eclipse at all https://learn.illinois.edu/mod/quiz/review.php?attempt=32225175&cmid=8198765 17/18 1/30/24, 10:15 PM Homework 1: Attempt review | Learn@Illinois Question 34 Correct 1.00 points out of 1.00 The ecliptic is defined as the Select one: a. band of constellations through which the Sun and Moon move in our sky. b. line in the sky that is perpendicular to Earth's spin axis. n line traced in our sky by the Moon each month against the background stars. line traced in our sky by the Sun over one year against the background stars. ¥ Correct! https://learn.illinois.edu/mod/quiz/review.php?attempt=32225175&cmid=8198765 18/18
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