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Exam1 - Flashcards - The flashcards are formatted for...

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Star Planet
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A moderately large object which orbits a star. Fuses hydrogen into helium and thereby generates energy.
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Moon (or Satellite) Asteroid
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A relatively small and rocky object that orbits a star. An object that orbits a planet.
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Comet Solar (Star) System
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A star and all the material that orbits it, including its planets and moons. A relatively small and icy object that orbits a star.
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Galaxy Groups (or Clusters)
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Collections of galaxies all held together by gravity. A collection of star systems, all held together by gravity.
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Universe 1. Planet Earth 2. Solar System 3. Milky Way 4. Local Group 5. Local Supercluster 6. Universe
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Cosmic “address” The sum total of all matter and energy; everything within and between all galaxies
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Supercluster Observable Universe
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The portion of the entire universe that can be seen from Earth. Many individual galaxies and many groups and clusters of galaxies are packed closely together.
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Astronomical Unit (AU) Light-year
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The distance that light can travel in one year (about 9.46 trillion kilometers). The average distance between Earth and the Sun (about 150 million kilometers); the length of the semimajor axis of Earth’s orbit.
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Rotation Axis
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An imaginary line connecting the North Pole to the South Pole through the center of the Earth. The spinning of an object around its axis once each day.
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Orbit (Revolution) Expansion (of the Universe)
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The increase in the average distance between galaxies as time progresses. The orbital motion of one object around another.
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Celestial Sphere Star Stuff
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All atoms (except for hydrogen and most helium) were created inside stars and eventually ejected into space.
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