Question 1 The final stage of evolution of the most massive stars is a: Answer black hole. main-sequence star. red giant. white dwarf. 4 points Question 2 Based on the observed red shifts in the spectral lines of distant galaxies, astronomers conclude that: Answer Earth is the center of the universe. the universe is contracting. the universe is expanding. the universe is in a steady state. 4 points Question 3 Which of the following astronomers derived two basic laws of planetary motion, then later added a third? Answer Galileo Kepler Copernicus Brahe 4 points Question 4 The discovery that the universe appears to be expanding led to a widely accepted theory called: Answer the Big Bang. Hubble's Law. Einstein's Law. the Doppler Effect. 4 points Question 5 __________ galaxies are sometimes called dwarf galaxies, being typically smaller than spiral galaxies. Answer Elliptical Irregular Normal Barred 4 points Question 6 __________ has a hot, turbulent atmosphere dominated by carbon dioxide. Answer Mars Jupiter Mercury Venus 4 points Question 7 Which theory held that the Earth was a sphere that stayed motionless at the center of the universe? Answer Heliocentric Geocentric Big Bang Stationary 4 points Question 8 According to the Ptolemaic (Greek) model of the universe, how many "heavenly" bodies could be observed wandering along the background of stars? Answer One Nine Five Seven 4 points Question 9 Which main-sequence stars are the least massive? Answer Red Orange Yellow Blue 4 points Question 10 Which of the following is a FALSE statement? Answer Stars that appear the brightest are of the first magnitude, while the faintest stars visible to the unaided eye are of the sixth magnitude. Most stars have such small parallax shifts that accurate measurement is always possible. Stellar parallax is the extremely slight back-and-forth shifting in the apparent position of a nearby star due to the orbital motion of the Earth. Emission nebulae are gaseous masses that consist largely of hydrogen. 4 points Question 11 Describe the Hertzsprung-Russel diagram. How is it useful in classifying stars? Where do stars tend to cluster on the diagram? Where on the H-R diagram does a star spend most of its life? Answer 30 points Question 12 Discuss stellar evolution (describing each stage in brief). What forces are opposing one another throughout the life of a star and how do they influence the various stages in the life cycle of a star? H essay-ans-_9720 ...

1. Question 1
The final stage of evolution of the most massive stars is a:
Answer
black hole.
main-sequence star.
red giant.
white dwarf.
4 points
Question 2
Based on the observed red shifts in the spectral lines of distant
galaxies, astronomers conclude that:
Answer
Earth is the center of the universe.
the universe is contracting.
the universe is expanding.
the universe is in a steady state.
4 points
Question 3

2. Which of the following astronomers derived two basic laws of
planetary motion, then later added a third?
Answer
Galileo
Kepler
Copernicus
Brahe
4 points
Question 4
The discovery that the universe appears to be expanding led to a
widely accepted theory called:
Answer
the Big Bang.
Hubble's Law.
Einstein's Law.
the Doppler Effect.
4 points
Question 5
__________ galaxies are sometimes called dwarf galaxies,
being typically smaller than spiral galaxies.

3. Answer
Elliptical
Irregular
Normal
Barred
4 points
Question 6
__________ has a hot, turbulent atmosphere dominated by
carbon dioxide.
Answer
Mars
Jupiter
Mercury
Venus
4 points
Question 7
Which theory held that the Earth was a sphere that stayed
motionless at the center of the universe?
Answer

4. Heliocentric
Geocentric
Big Bang
Stationary
4 points
Question 8
According to the Ptolemaic (Greek) model of the universe, how
many "heavenly" bodies could be observed wandering along the
background of stars?
Answer
One
Nine
Five
Seven
4 points
Question 9
Which main-sequence stars are the least massive?
Answer
Red

5. Orange
Yellow
Blue
4 points
Question 10
Which of the following is a FALSE statement?
Answer
Stars that appear the brightest are of the first magnitude, while
the faintest stars visible to the unaided eye are of the sixth
magnitude.
Most stars have such small parallax shifts that accurate
measurement is always possible.
Stellar parallax is the extremely slight back-and-forth shifting
in the apparent position of a nearby star due to the orbital
motion of the Earth.
Emission nebulae are gaseous masses that consist largely of
hydrogen.
4 points
Question 11
Describe the Hertzsprung-Russel diagram. How is it useful in
classifying stars? Where do stars tend to cluster on the diagram?
Where on the H-R diagram does a star spend most of its life?

6. Answer
30 points
Question 12
Discuss stellar evolution (describing each stage in brief). What
forces are opposing one another throughout the life of a star and
how do they influence the various stages in the life cycle of a
star?
H
essay-ans-_9720