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Download Astronomy Unit Vocabulary Term Definition Example Light years are
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Astronomy Unit Vocabulary Term astronomical unit Big Bang theory electromagnetic spectrum galaxy Hertzsprung Russell Diagram illuminated light year luminosity Milky Way Galaxy Definition A unit of measurement used in astronomy. Equal to the distance from the earth to the sun. Theory that states that the formation and expansion of the universe resulted from an initial explosion. Example 1 AU SUN EARTH The range of electromagnetic waves placed in order of increasing frequency and decreasing wavelength. A collect of millions of stars held together by gravity. A graph of star’s luminosity and temperature / color. A word used to describe an object that can be seen because it reflects light. Light years are used to measure distances to and between The distance light travels in one objects in space because units year. such as kilometers are not big enough to measure distances in space. Some stars are brighter than The amount of light an object others. Thus, some stars have emits or gives off. higher luminosities than others. The galaxy we live in. Contains our sun and planets. Term Definition Example Any portion of the illuminated moon visible from earth during a month. moon phase neap tide Weak tides that occur during the quarter moon phase. To orbit a central point. The earth revolves around the Sun. To turn on an axis. The earth rotates on its axis, resulting in day and night. revolve rotate spectroscope spring tide tides visible light An instrument used to view the different colors of light produced by different sources. Strong tides that occur during the full and new moon. The rise and fall of large bodies of water due to the pull of gravity. The small portion of electromagnetic radiation that humans can see with the unaided eye.