Download Astronomy Test Review

Astronomy
Test Review
Reviewing Content
1. c) light years
 2. d) magnitude
 3. b) stellar parallax
 4. d) blue
 5. c) main
sequence
 6. c) red giant
 7. a) black hole

8. b) neutron stars
 9. a) distance from
Earth
 10. d) the big bang

Understanding Concepts
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11. The temperature of a star can be determined
by its color.
13. Parallax is the apparent displacement
(movement) of an object due to the change in
position of the observer.
14. Apparent magnitude is how bright a star is as
seen from Earth where as absolute magnitude is
the brightness of a star from a standard
distance. (10 parsecs)
Understanding Concepts
15. Most massive main-sequence stars
are blue while the least massive are red.
 16. Nuclear fusion begins at 10 million
celcius.
 17. A main-sequence star is at equilibrium
between gravity and gas pressure.
 18. The main fuel for main-sequence stars
is hydrogen while red giants burn helium.

Understanding Concepts
19. SuperGiants and some Red giant stars
end their lives as supernovas. (and some
Blue giants)
 20. A pulsar is a spinning neutron star that
gives off pulses of energy. (radio waves)
 21. It takes our solar system 200 million
years to orbit the Milky Way.
 22. Greater red shifts mean the universe is
expanding.

Understanding Concepts

24. Radio telescopes are used to
determine the structure of the Milky Way
because it allows astronomers to “see”
through the dust and gas particles that
block optical viewing.
Analyzing Data
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26. Brightest Star: Rigel
 Hottest
Star: Sirius B
27. White dwarfs have a low absolute
brightness as compared to supergiants
 28. As absolute brightness increases the
surface temperature also increases. This
is a direct relationship.

1. What factor affects the color of a star?
2. What factor affects the luminosity of a star?
1. Temperature
2. Size, temperature, distance
3. What is the approximate surface temperature of
the sun?
3. 6000 K
4. Is the surface temperature of white dwarf stars
higher or lower than red super giants?
4. Much Higher
5. Why are Red Giants some much brighter than
white dwarfs even though they are cooler?
5. So much larger
6. List the color of the stars from hottest to coldest:
6. Blue, white, yellow, orange, red
7. Most of the stars on the HR Diagram are
classified as which type of star?
7. Main sequence
8. What type of star has a high temperature but a
low luminosity?
8. Red super giants
9. What type of star has a high temperature
and a high luminosity?
9. Blue giants
10. What type of star has a low temperature
but a high luminosity?
10. Red giants/Red super giants
11. What type of star has a low temperature
and a low luminosity?
11. Main sequence/Red dwarfs
12. What will happen next to the main
sequence stars
12. Become red giants
13. What will happen to the white dwarfs?
13. Become black dwarfs
14. What label could be used instead of
luminosity?
14. Absolute brightness
15. Which stars will probably end in a
supernova explosion
15. Red super giants