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43 Cards in this Set
- Front
- Back
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The Sun formed from the gravitational collapse of a cold ____. A. Red giant B. Planet C. Planetary nebula D. Interstellar cloud |
D. Interstellar cloud |
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Massive stars burn their fuel less rapidly than low-mass stars. |
F |
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_______ are hot, compact stars whose mass is comparable to the Sun's and size to the Earth's. A. White dwarfs B. Neutron stars C. Pulsars D. Black holes |
B. Neutron stars |
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The last fusion product possible in stars _____ because _____. A. Lead; fusing lead nuclei absorbs energy; it does not liberate it B. Iron; fusing iron nuclei absorbs energy; it does not liberate it C. Iron; no stars are hot enough in their cores to fuse iron nuclei D. Carbon; no stars are hot enough in their cores to fuse carbon nuclei |
B. Iron; fusing iron nuclei absorbs energy; it does not liberate it |
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Main sequence stars are in hydrostatic equilibrium. |
T |
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The gold found in jewelry is made during a supernova. |
T |
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The gravitational collapse of an interstellar cloud can be triggered by a collision with another cloud. |
T |
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Red giants are huge because their outer layers have expanded to a very low density tenuous atmosphere. |
T |
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_____ is the most significant force that determines the evolution of stars. A. Temperature B. Luminosity C. Energy D. Gravity |
D. Gravity |
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In which stage of a star's evolutionary cycle does it spend the most time? A. The pre-main sequence B. The main sequence C. The post-main sequence |
B. The main sequence |
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What characteristic do all stars on the main sequence share? A. They all have the same size. B. They all have the same luminosity C. They all have the same temperature D. They are all fusing hydrogen into helium in their cores. E. They will all go through a helium flash in the future. |
D. The are all fusing hydrogen into helium in their cores. |
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The Sun will leave the main sequence in about _____ years from now. A. 5 million B. 100 billion C. 100 million D. 5 billion |
D. 5 billion |
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Which of the following elements in your body is formed in the stars? A. Carbon B. Oxygen C. Calcium D. Iron E. All of the above |
E. All of the above |
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If the Sun were instantly replaced by a black hole of the same mass as our Sun, the Earth would be sucked into the black hole. |
F |
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The most important property that determines the evolution of a star is its A. Temperature B. Composition C. Mass D. Location |
C. Mass |
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The lifetime of a star is dependent on its _____. A. Mass B. Volume C. Luminosity D. Temperature |
A. Mass |
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A black hole is an object with escape velocity about half of the speed of light. |
F |
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Where do most of the elements heavier than iron form? A. In the interior of stars B. In the interior of high-mass stars C. In supernova explosions D. In the interstellar clouds. |
C. In supernova explosions |
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If left in isolation a white dwarf will eventually A. Cool off and become a black dwarf B. Explode as a Type Ia supernova C. Form a brown dwarf D. Become the seed for a new star |
A. Cool off and become a black dwarf |
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The surface temperature of a white dwarf is higher than the surface temperature of the Sun. |
T |
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If a star is in hydrostatic equilibrium A. It is in a stable binary orbit B. It is generating energy at the same rate everywhere C. It is near the end of its life D. It must be losing mass E. Its radiation pressure outwards and gravitational forces inwards are in balance. |
E. Its radiation pressure outwards and gravitational forces inwards are in balance. |
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The Sun lies _____ the disk of our Milky Way Galaxy. A. At the center of B. About half of the way out in C. About one-tenth of the way out in D. In the halo above |
B. About half of the way out in |
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What is the approximate diameter of the Milky Way Galaxy in light years? A. 10 B. 100 C. 1,000 D. 100,000 E. 1,000,000 |
D. 100,000 |
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The Chandrasekhar limit is the largest _____ a white dwarf can have. A. Speed B. Mass C. Temperature D. Wavelength |
B. Mass |
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The solar system is located about 8 light years away from the galactic center. |
F |
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Astronomers can measure the diameter of our Milky Way Galaxy by plotting the position of globular star clusters. |
T |
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The space between the stars is known to contain A. A large quantity of dust but no gas at all B. A variable amount of gas but no dust at all C. A perfect vacuum D. Both gas (atomic or molecular) and dust |
D. Both gas (atomic or molecular) and dust |
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The Milky Way has no sharply defined outer edge. |
T |
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The study of the structure and evolution of the Universe is called _____. A. Anthropology B. Cosmology C. Astrology D. Archaelogy |
B |
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The estimated age of the Milky Age galaxy is about _____. A. 20 billion years B. 100,000 years C. 13 billion years D. 4.6 billion years |
C. 13 billion years |
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The Milky Way galaxy contains about _____ stars. Most of these stars are probably _____. A. 100 billion; red giants B. 100 billion; O and B type stars C. 10 billion; white dwarfs D. 100 billion; cool dwarfs |
D. 100 billion; cool dwarfs |
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A _____ happens when a single high mass star explodes. A. Nova B. Type Ia supernova C. Type II supernova D. Pulsar E. None of the above |
C. Type II supernova |
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Dust and gas in the Milky Way A. Are spread evenly throughout the halo and disk B. Are concentrated in a thin layer in the disk C. Are found in different places: dust primarily in the disk and gas primarily in the halo D. Are found in different places: gas primarily in the disk and dust primarily in the halo |
B. Are concentrated in a thin layer in the disk |
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The main parts of the Milky Way galaxy are the disk, the bulge and the halo. |
T |
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The escape velocity inside a black hole is A. Zero B. Infinity C. Unknown D. Half the speed of light E. Greater than the speed of light |
E. Greater than the speed of light |
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A method for identifying a black hole is to A. Observe them directly through the space-based telescopes B. Look for voids (holes) in the star fields C. Look for its effect on nearby companions D. Search for radio waves from the accretion disk |
C. Look for its effect on nearby companions |
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What is the escape velocity at the event horizon of a black hole? A. Speed of sound B. Supersonic speed C. Speed of light D. Half the speed of light |
C. Speed of light |
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_____ are hot, compact remnant stars whose mass is typically between one and several times that of the Sun, but their size is only 10 km or less. A. White dwarfs B. Neutron stars C. Pulsars D. Black dwarfs |
B. Neutron stars |
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A _____ happens when a white dwarf in a binary system accumulates more mass than Chandrasekhar limit. A. Nova B. Type Ia supernova C. Type II supernova D. Pulsar E. None of the above |
B. Type Ia supernova |
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What type of object is believed to be the central source of energy for an active galaxy? A. An unusually large and bright main sequence star B. A large amount of gas and dust C. A massive black hole D. Globular cluster |
C. A massive black hole |
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Galactic cannibalism is the capture of the stars in a smaller galaxy by a larger galaxy during collision between the two. |
T |
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Which of the following objects do you expect to find at the center of a planetary nebula? A. Planet B. Neutron star C. White dwarf D. Black hole |
C. White dwarf |
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Voids are A. Spaces between stars B. Spaces between galaxies within a cluster C. Huge regions of space with few or no galaxies D. Regions in the centers of galaxies containing many black holes |
C. Huge regions of space with few or no galaxies. |
