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Bell Question 11/09/11
1. Describe the life cycle of a star the size
of our sun. (5 pts.)
Three types of Galaxies
• A spiral galaxy has a
nucleus of bright stars
and flattened arms
that spiral around the
nucleus.
• Elliptical galaxies
have various shapes
and are extremely
bright in the center
and do not have spiral
arms.
• An irregular galaxy
has no particular
shape, and is fairly
rich in dust and gas.
Evidence for the Big Bang
cosmic background radiation - uniformly
detected from every direction in space;
considered a remnant of the big bang.
What the Universe is Made of
4% Stars and planets
23% Dark Matter – doesn’t give off light but
has gravity
73% Dark Energy - ??? May be a force that
opposes gravity
1.
What accounts for different stars being
seen in the sky during different seasons of
the year?
A. Stellar motion around Polaris
B. Earth’s rotation on its axis
C. Earth’s revolution around the sun
D. Position north or south of the equator
1.
What accounts for different stars being
seen in the sky during different seasons of
the year?
A. Stellar motion around Polaris
B. Earth’s rotation on its axis
C. Earth’s revolution around the sun
D. Position north or south of the equator
Chapter 30
2. How do stellar spectra provide evidence
that stars are actually moving?
F. Dark line spectra reveal a star’s composition.
G. Long exposure photos show curved trails.
H. Light separates into different wavelengths.
I. Doppler shifts occur in the star’s spectrum.
Chapter 30
2. How do stellar spectra provide evidence
that stars are actually moving?
F. Dark line spectra reveal a star’s composition.
G. Long exposure photos show curved trails.
H. Light separates into different wavelengths.
I. Doppler shifts occur in the star’s spectrum.
Chapter 30
3. What happens to main sequence stars
when energy from fusion is no longer
available?
A. They expand and become supergiants.
B. They collapse and become white dwarfs.
C. They switch to fission reactions.
D. They contract and turn into neutron stars.
Chapter 30
3. What happens to sun-like main sequence
stars when energy from fusion is no
longer available?
A. They expand and become supergiants.
B. They collapse and become white dwarfs.
C. They switch to fission reactions.
D. They contract and turn into neutron stars.
Chapter 30
4. Which type of star is most likely to be
found on the main sequence?
F. a white dwarf
G. a red supergiant
H. a yellow star
I. a neutron star
Chapter 30
4. Which type of star is most likely to be
found on the main sequence?
F. a white dwarf
G. a red supergiant
H. a yellow star
I. a neutron star
Chapter 30
5. Evidence for the big-bang theory is
provided by
A. cosmic background radiation
B. apparent parallax shifts
C. differences in stellar luminosity
D. star patterns called constellations
Chapter 30
5. Evidence for the big-bang theory is
provided by
A. cosmic background radiation
B. apparent parallax shifts
C. differences in stellar luminosity
D. star patterns called constellations