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11 Cards in this Set
- Front
- Back
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Our Solar System is composed of _________. - a few hundred billion stars, bound together by gravity - the Sun and all the objects that orbit it - the Sun and the planets, and nothing else - the Sun and several nearby stars, as well as the planets and other objects that orbit these stars |
the Sun and all the objects that orbit it |
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Which of the following is the best description of the Universe? - the sum total of all matter and energy - all the galaxies in all the superclusters - our Milky Way Galaxy - a vast collection of stars that number as many as the grains of sand on all the beaches on Earth |
the sum total of all matter and energy |
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A TV commercial stating that a piece of merchandise is light-years ahead of its time is nonsensical because _________. - it uses "light-years" to discuss time, but a light-year is a unit of distance, not time - a light-year is an astronomically large unit, so a product could not possibly be so advanced - it doesn't specify the number of light-years - light-years can only be used to talk about light |
it uses "light-years" to discuss time, but a light-year is a unit of distance, not time |
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Our entire solar system orbits around the center of the _________ about once every 230 million years. |
Milkyway Galaxy |
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The Milky Way and Andromeda galaxies are among a few dozen galaxies that make up our ______. |
Local Group |
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The Sun appears to rise and set in our sky because Earth _______ once each day. |
rotates |
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You are one year older each time Earth_______ about the Sun. |
orbits |
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On average, galaxies are getting farther apart with time, which is why we say our ________ is expanding. |
universe |
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Our________ is moving toward the star Vega at about 70,000 km/hr. |
solar system |
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How old is our Solar System compared to the age of the Universe? |
one-third of the age of the universe. |
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Rank the following items according to their size (diameter) from left to right, from largest to smallest. |
1. The Universe 2. The local supercluster 3. The local group 4. The milky way galaxy 5. our solar system 6. the Sun 7. Jupiter 8. Earth |
