Astr 100 Study guides, Class notes & Summaries
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ASTR 102 Quiz Questions | 100% Correct Answers | Verified | Latest 2024 Version
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ASTR 102 Quiz Questions | 100% Correct 
Answers | Verified | Latest 2024 Version
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ASTR 102 Midterm 2 | 100% Correct Answers | Verified | Latest 2024 Version
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ASTR 102 Midterm 2 | 100% Correct Answers | 
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ASTR 102 Midterm Exam Questions | 100% Correct Answers | Verified | Latest 2024 Version
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ASTR 102 Midterm Exam Questions | 
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ASTR 1303 FINAL EXAM 2024 WITH 100% CORRECT ANSWERS
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Gravity is an ________ force between two objects with mass, acting along the line between them. - correct answer attractive 
 
How many stars are in the Milky Way galaxy? - correct answer 200 billion 
 
Newton's first law of motion says that an object at constant velocity will remain at constant velocity unless acted upon by a - correct answer force 
 
In his General Theory of Relativity, Einstein revised our understanding of - correct answer gravity 
 
Early astronomers believed the earth was ...
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ASTR 102 Midterm Exam Questions | 100% Correct Answers | Verified | Latest 2024 Version
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The apparent motion of a foreground object relative to a distant background as the observers position 
changes? - Parallax 
When measuring parallax the distance between two observation points is called? - Baseline 
If Earth rotated twice as fast as it currently does, but its motion around the Sun stayed the same, then? 
A. The night would be twice as long 
B. The night would be half as long 
C. The year would be half as long 
D. The length of the day would be unchanged. - B. 
A long, thin cloud ...
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ASTR 102 Midterm 2 | 100% Correct Answers | Verified | Latest 2024 Version
- Exam (elaborations) • 21 pages • 2024
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A star has an apparent brightness of -2 and an absolute brightness of 1. What must be true? 
Select one: 
a. The star is further than 10 parsecs 
b. The star is at 10 parsecs 
c. The star is closer than 10 parsecs 
d. The star is close to exploding - c 
What is special about electromagnetic waves? 
Select one: 
a. We can see all of them 
b. They do not need a medium to travel 
c. They only exist near stars 
d. Each color travels at a different speed - b 
A star that has a smaller absolute bright...
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ASTR 102 Quiz Questions | 100% Correct Answers | Verified | Latest 2024 Version
- Exam (elaborations) • 21 pages • 2024
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We have learned that the centre of the milky way contains a very massive black hole. We developed this 
understanding by: - Monitoring the orbital motions of many individual stars in the very central parts 
of the Milky Way 
If the sun were to be squashed down small enough to become a black hole, then: - The planets in the 
solar system would orbit the Sun in unchanged fashion (but would receive no light from it) 
The first stellar mass black hole identified, Cygnus X-1, was found in 1973. The n...
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ASTR 102 Final Lecture Questions | 100% Correct Answers | Verified | Latest 2024 Version
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ASTR 102 Final Lecture Questions | 
100% Correct Answers | Verified | Latest 
2024 Version
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ASTR 102 Final Lecture Questions | 100% Correct Answers | Verified | Latest 2024 Version
- Exam (elaborations) • 17 pages • 2024
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Q1.1: If every star in the universe was a grain ofsand, which of the following would be filled ~4meters 
deep in sand? 
A. This classroomB. Cal Poly campusC. SLO countryD. CaliforniaE. Continental US - SLO 
Q3.2: If you walk out of this building and face directly south, which direction is east? 
A. Slightly to the rightB. Slightly to the leftC. Directly rightD. Directly leftE. Behind you - D 
Q4.1: Imagine that from your current location you observe a star rising directly in the east.When this s...
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ASTR 181 EXAM 1 2024 WITH 100% CORRECT ANSWERS
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How many stars are in our galaxy? - correct answer 4 x 10^11 
 
What is our cosmic address? - correct answer Earth 
Solar System 
Interstellar Neighborhood 
Milky Way 
Lanieakea 
Observable Universe 
Infinite Universe 
 
What is an astronomical unit? - correct answer The average distance between the Sun and the Earth 
 
As a blackbody becomes hotter, it also becomes ______ and ______. - correct answer More luminous, bluer. 
 
If an electromagnetic wave's frequency increased, then - correct ...
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