A) It is about 1% as old as the universe.
B) It is between about 5% and 10% as old as the universe.
C) It is about one-third the age of the universe.
D) It is nearly the same age as the universe.
F) All of the above
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A) Earth's rotation carries most people around the axis faster than a commercial jet travels,and Earth's orbit carries us around the Sun faster than the Space Shuttle orbits Earth.
B) Earth's rotation carries most people around the axis at about the speed of a commercial jet,and Earth's orbit carries us around the Sun at a higher speed.
C) Earth's rotation carries most people around the axis at about the speed of a car on the freeway,and Earth's orbit carries us around the Sun at about the speed of a commercial jet.
D) Earth's rotation carries most people around the axis at about the speed at which the Space Shuttle orbits Earth,and Earth's orbit carries us around the Sun at nearly the speed of light.
F) C) and D)
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A) the size of a typical dorm room
B) the size of a typical campus building
C) the size of a typical campus
D) the size of a small city
E) the size of a western state (e.g. ,Colorado)
G) A) and C)
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A) as it was 1,000 years ago.
B) as it was 1,000 light-years ago.
C) as it is right now,but it appears 1,000 times dimmer.
D) looking just the same as our ancestors would have seen it 1,000 years ago.
F) A) and B)
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A) several days
B) several weeks
C) several years
D) several thousand years
E) hundreds of thousands of years
G) B) and D)
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A) Everything in the universe is gradually growing in size.
B) Within galaxies,average distances between star systems are increasing with time.
C) The statement is not meant to be literal;rather,it means that our knowledge of the universe is growing.
D) Average distances between galaxies are increasing with time.
F) B) and D)
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Although it orbits a star and ...View Answer
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A) the event that marked the beginning of the expansion of the universe
B) a gigantic explosion that blew all the galaxies in the universe to smithereens
C) the explosion of a massive star at the end of its life
D) the event that marked the birth of our solar system
F) B) and C)
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A) 10 thousand years
B) 230 thousand years
C) 1 million years
D) 100 million years
E) 230 million years
G) A) and C)
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A) that portion of the universe that we have so far photographed through telescopes.
B) the portion of the universe that can be seen by the naked eye.
C) the portion of the universe that is not hidden from view by,for example,being below the horizon.
D) that portion of the universe that we can see in principle,given the current age of the universe.
F) None of the above
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A) the Sun and all the objects that orbit it.
B) the Sun and the planets,and nothing else.
C) a few hundred billion stars,bound together by gravity.
D) the Sun and several nearby stars,as well as the planets and other objects that orbit these stars.
F) All of the above
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A) the plane of Earth's orbit around the Sun
B) the plane of Earth's equator
C) the plane of the Sun's equator
D) the plane of the Milky Way Galaxy
F) A) and D)
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A) within the past 500 years
B) about 2,500 years ago
C) about 1,000 years ago
D) We haven't;there is still considerable scientific debate about whether Earth is the center of the universe.
F) B) and C)
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A) It was produced in the Big Bang.
B) It was created by chemical reactions in interstellar space.
C) It was produced by the nuclear fusion in stars that made the heavy elements.
D) It was made by our Sun.
E) It was made by nuclear fission of uranium and other radioactive materials.
G) A) and C)
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A) The overall chemical composition of our bodies is about the same as that of stars.
B) Movie stars and other people are all made of the same stuff,so we all have the potential to be famous.
C) Nearly every atom from which we are made was once inside of a star.
D) We could not survive without light from our star,the Sun.
F) None of the above
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The Big Bang produced hydrogen and heliu...View Answer
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A) 1 billion
B) 100 billion
C) 10 billion
D) 100 million
E) 100 trillion
G) A) and E)
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A) all the sand in a typical playground sandlot
B) all the sand on Miami Beach
C) all the sand on the beaches of California
D) all the sand on the beaches in the United States
E) more than all the sand on all the beaches on Earth
G) C) and D)
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A) Without galaxies,there could not have been a Big Bang.
B) Without galaxies,the universe could not be expanding.
C) Galaxies prevent planets from leaving their orbits around stars;e.g. ,our galaxy prevents Earth from leaving its orbit of the Sun.
D) Galaxies recycle heavy elements produced in stars into future generations of stars.
E) Galaxies provide the gravity that prevents us from falling off Earth.
G) A) and B)
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A) Planets are smaller than stars.
B) Planets are dimmer than stars.
C) All planets are made of rock and all stars are made of gas.
D) Planets orbit stars,while stars orbit the center of the galaxy.
F) A) and D)
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