An astronomical unit (AU) is ________. A) any very large unit, such as a light-year B) the current distance between Earth and the Sun C) the average distance between Earth and the Sun D) the average distance between any planet and the Sun
answer
the average distance between Earth and the Sun
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Where is our solar system located within the Milky Way Galaxy?
answer
roughly halfway between the center and the edge of the visible disk of the galaxy
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About where is our solar system located within the Milky Way Galaxy?
answer
about two-thirds of the way from the center of the galaxy to the outskirts of the galactic disk
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Which of the following has your "cosmic address" in the correct order? (What is your "cosmic address?"
answer
You, Earth, solar system, Milky Way Galaxy, Local Group, Local Supercluster, universe.
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TRUE/FALSE. The solar system contains about 100 billion stars.
answer
False
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Our solar system consists of ________. A) the Sun and the planets, and nothing else B) the Sun and several nearby stars, as well as the planets and other objects that orbit these stars C) a few hundred billion stars, bound together by gravity D) the Sun and all the objects that orbit it.
answer
the Sun and all the objects that orbit it.
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Why do the patterns of the stars in our sky look the same from year to year?
answer
because the stars in the constellations are so far away
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A typical galaxy is a ________.
answer
collection of a few hundred million to a trillion or more stars, bound together by gravity
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What is an astronomical unit?
answer
the average distance from Earth to the Sun
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Which of the following statements about the Milky Way Galaxy is not true?
answer
Our solar system is located very close to the center of the Milky Way Galaxy.
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What is the meaning of the word cosmos?
answer
the sum total of all matter and energy, that is, everything within and between all galaxies
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Which of the following best describes the Milky Way Galaxy?
answer
a spiral galaxy with a disk about 100,000 light years in diameter and containing between 100 billion and 1 trillion stars
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Which of the following statements does not use the term light-year in an appropriate way?
answer
It will take me light-years to complete this homework assignment.
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Which of the following best describes what we mean by the universe?
answer
the sum total of all matter and energy
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Which of the following has your "address" in the correct order?
answer
you, Earth, solar system, Milky Way, Local Group, Local Supercluster
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Which of the following is smallest? A) 1 light second B) size of a typical planet C) size of a typical star D) 1 AU
answer
size of a typical planet
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TRUE/FALSE. One light-year is about 10 trillion kilometers.
answer
True
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What is the Sun mainly made of?
answer
hydrogen and helium
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How many galaxies are there in the observable universe?
answer
roughly a thousand times more than the number of stars in our galaxy
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What do we mean when we say that the universe is expanding?
answer
Average distances are increasing between galaxies.
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TRUE/FALSE. The observable universe is the same size today as it was a few billion years ago.
answer
False
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If you represented each star by a grain of sand, how much sand would it take to represent all the stars in the universe?
answer
more than all the sand on all the beaches on Earth
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TRUE/FALSE. Our solar system is located in the center of the Milky Way Galaxy.
answer
False
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Roughly how many stars are in the Milky Way Galaxy?
answer
100 billion
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Which of the following is largest? A) size of Pluto's orbit B) size of a typical galaxy C) 1 light year D) distance to the nearest star (other than our Sun)
answer
size of a typical galaxy
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The number of stars in the Milky Way Galaxy is approximately ________.
answer
a few hundred billion
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