Chapter 1 – Space Questions And Answers – Flashcards
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Astronomical Unit
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Earth's average distance from the Sun.
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The star Betelgeuse is about 600 light-years away. If it explodes tonight,
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we won't know about it until 600 years from now.
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Could we see a galaxy that is 50 billion light-years away?
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No, because it would be beyond the bounds of our observable universe.
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Which of the following correctly lists our "cosmic address" from small to large?
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Earth, solar system, Milky Way Galaxy, Local Group, Local Supercluster, universe;
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If we represent the solar system on a scale that allows us to walk from the Sun to Pluto in a few minutes, then:
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the planets would all be marble size or smaller and the nearest stars would be thousands of miles away.
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How long in seconds does it take light to travel from the Moon to Earth?
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1.28 s
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How long in seconds does it take light to travel from the Sun to Earth?
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499 s
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If stars existed but galaxies did not:
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We would not exist because we are made of material that required recycling in galaxies.
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The age of our solar system is about:
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one-third of the age of the universe.
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When we say the universe is expanding, we mean that:
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The average distance between galaxies is growing with time.
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The fact that nearly all galaxies are moving away from us, with more distant ones moving faster, helped us to conclude that:
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The universe is expanding.
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The age of our solar system is about
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1/3 of the age of the universe.
