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University of Colorado, Boulder *
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1000
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Astronomy
Date
Apr 3, 2024
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9
Uploaded by MateGrouse3693
1 Name: ___________________________________ Student ID #: _____________________________ ASTR 1000 – 002 Intro to the Solar System Exam #1 13 February, 2024 ●
Write your name on each exam page. ●
Answer questions 1-15 on the bubble sheet provided using a #2 pencil.
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Answer questions 16-19 in space provided.
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Turn in this complete exam form and bubble sheet.
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For multiple choice and T/F, always select the BEST answer
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Please write legibly for short answer questions using no more than 3 sentences each. ●
You are allowed a 2-sided handwritten cheat sheet, and no other external resources.
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Please raise your hand if you have questions
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Phones should remain out of sight throughout the exam.
Please remember that this exam, like all assignments you complete as a CU student, is covered by the University Honor Code. Make sure your student ID #, test form letter (A), and name are on your Scantron sheet. Make sure your name and student ID # are on this exam.
2 Name:________________________________ Part A. Multiple Choice. Submit answers via scantron. Scoring: 1 point/each. 1. Astronomers saw (last night) a bright supernova explode in the Andromeda galaxy (the nearest big galaxy in the local group; located 2.5 million ly away). The remnants from such explosions disperse in about 10,000 years. Which of the following statements is true (select one). A.
The supernova remnant still exists now, and we will watch it disperse over the next 10,000 Earth years. B.
In reality, the supernova remnant has already dispersed, but we will watch it disperse over the next 10,000 Earth years. C.
The image of the supernova dispersing will not reach us for another 2.5 million years. D.
We will never see the supernova remnant because it has already dispersed. E.
The supernova remnant still exists now, and we will watch it disperse over the next 2.5 million Earth years. Answer: B 2. What causes the stars to rise and set? A.
The Earth’s orbit around the Sun B.
Earth spinning on its axis C.
Our solar system moving in the Milky Way Galaxy D.
The Sun’s movement around the Earth E.
The Earth changing its axial tilt Answer: B 3. On the scale of the cosmic calendar, in which the history of the universe is compressed to 1 year, how long has human civilization (i.e., since ancient Egypt) existed? A.
about half the year B.
about a month C.
a few hours D.
a few seconds E.
less than a millionth of a second Answer: D 4. The north-star is 40
o
above your horizon, due north. Where are you? A.
You are at the North Pole. B.
You are on the equator. C.
You are at longitude 40
o
E. D.
You are at latitude 40
o
N. E.
You are at latitude 40
o
S. Answer: D
3 5. Lunar eclipses can only happen when there is a _____ moon. A.
New B.
Full C.
Crescent D.
Gibbous E.
Super Answer: B Name:________________________________ 6. It is summer in the Northern Hemisphere when A.
the Northern Hemisphere is located closer to the Sun than the Southern Hemisphere. B.
the Northern Hemisphere is tilted toward the Sun and the Southern Hemisphere is tilted away. C.
Earth is at its nearest point to the Sun along its orbit. D.
Earth's axis points toward the North Star, Polaris. E.
There is exactly 12 hours between sunrise and sunset. Answer: B 7. We say that the Moon is gibbous
when A.
it appears to be more than half illuminated, but not full. B.
it appears to be less than half illuminated, but not new. C.
it is exactly half illuminated. D.
we see a thin crescent of light. E.
the Moon is visible in the morning. Answer: A 8. Why do we see essentially the same face of the Moon at all times? A.
because the other face points toward us only at new moon, when we can't see the Moon B.
because the Moon does not rotate C.
because the Moon's rotational and orbital periods are equal D.
because the Sun illuminates only one half of the Moon at a time E.
because the Moon has a nearly circular orbit around Earth Answer: C
4 9. The conditions required for a solar eclipse are A.
(1) the phase of the Moon must be new; (2) the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun. B.
(1) the phase of the Moon must be full; (2) the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun. C.
(1) the phase of the Moon can be either new or full; (2) the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun. D.
(1) the phase of the Moon must be new; (2) the Moon must be located at the nearest point in its orbit around Earth. E.
(1) the phase of the Moon must be full; (2) the Moon must be located at the nearest point in its orbit around Earth. Answer: A 10. The names of the seven days of the week are based on the A.
seven naked-eye objects that appear to move among the constellations. B.
seven planets closest to the Sun. C.
seven brightest stars in the prominent constellation Orion. D.
most popular Norse gods. E.
seven largest constellations of the ancient world. Answer: A Name:________________________________ 11. Which of the following is Not
a fundamental difference between the geocentric and Sun-
centered models of the solar system? A.
Earth is stationary in the geocentric model but moves around Sun in Sun-centered model. B.
Retrograde motion is real (planets really go backward) in geocentric model but only apparent (planets don't really turn around) in Sun-centered model. C.
Planetary orbits are circular in a sun centric model but require little circles whose centers rotate along big circle in the geocentric model. D.
The geocentric model is useless for predicting planetary positions in the sky, while even the earliest Sun-centered models worked almost perfectly. E.
Venus rotates around the Earth every 24 hours in the geocentric model but rotates around the Sun every 225 days in the Sun-centered model. Answer: D
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