Chapter 7 Unit 1 Science

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  1. Retrograde Motion: Is the movement of an object in the sky,usually a planet,that moves East to West, rather than the usual west to east motion.
  2. Solar System: Is the Sun and the objects that orbit the Sun.
  3. Why do we have seasons?: We have seasons, because the Earth is tilted and the Sun points to different parts of the Earth, that's why we have seasons.
  4. Solar Eclipse: Is when the Moon passes fully or partially in front of the Sun.
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  5. Lunar Eclipse: Is when the Moon crosses behind the Earth into its Umbra.
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  6. Phases of the Moon: Is the illuminated portion of the Moon on Earth.
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  7. Tides: The rise and fall of sea levels caused by the gravitational forces from the Moon and Sun.
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  8. Zenith: The constellation(s) that you see if you looked up into the night sky.
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  9. Circumpolar: Constellations that are visible all year long.
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  10. Pointer Stars: Are end stars that point toward the North Star, Polaris.
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  11. Asterism: A smaller group of stars that form patterns within a constellation.
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  13. Apparent Magnitude: Is the brightness of a celestial object as seen from Earth.
  14. Light-Year: Is the measure of light in years, which is 9.5 trillion km/year.
  15. Rotation: Is the turning of a body on its axisImage Upload 9
  16. Constellation: Is a group of stars that seem to form a pattern in the night sky.

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  17. Planets: A plane is an object that orbits one or more stars, is spherical, and doesn't orbit with any other object. Example: Earth
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  19. Meteor: Is a meteoroid that hits Earth's atmosphere and burns up.Image Upload 12
  20. Meteoroid: Is a piece of rock moving through space.
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  22. Asteroid: Is a no-spherical object believed to be debris left from the formation of the Solar System.
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  23. Comet: Is an object that is composed of ice,gasses, and rocky material and it comes from the Kaiper Belt.
  24. Heliocentric Model: Is a model of the solar system that the Sun is the center of the Solar System, and all of the planets revolved around the Sun.
  25. Trans-Neptunian Object: Any object that circle the sun beyond the orbit of Neptune.
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  26. Meteorite: Is a meteoroid that's large enough to pass through Earth's atmosphere and reach Earth.
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  27. Geocentric Model: Is a model of the solar system that believed that the Earth was the center of all planetary motion and the Sun revolved around the Earth.
  28. Orbital Radius: Is the average distance between the Sun and an object orbiting the Sun. 

  29. Astronomical Unit (AU): Is the average distance between a Planet and the Sun.
  30. Celestial Object: An object that is located outside of Earth's atmosphere, such as stars, comets, the Moon, the Sun, etc.
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  31. Revolution: The time it takes for an object to orbit.Image Upload 18
  32. Astronomer

    Is a person that studies Astronomy, the stars or the physical universe
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Chapter 7 Unit 1 Science
Flash Cards for Science Unit 7
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