sciencedch3

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Anonymous
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5084
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sciencedch3
Updated:
2010-01-25 12:38:12
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Science Test Unit D. Chapter 3
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Unit D chapter 3
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  1. A _________________ is an instrument used to observe distant objects.
    telescope
  2. A day is the time it takes Earth to make one _____________________.
    rotation
  3. A ______________ is a burning ball of gases.
    star
  4. A ________________ is a space object made of ice, dust, and gases.
    comet
  5. A year is the time it takes Earth to make one ____________________.
    revolution
  6. The path a planet takes around the sun is its ______________.
    orbit
  7. An _____________ is a rocky object that orbits the sun in a path between Mars and Jupiter.
    astoroid
  8. A __________________ is a group of planets and their moons that orbits a central star.
    solar system
  9. Any object orbiting another object is a _______________________.
    satellite
  10. The four planets nearest the sun are called the _____________________.
    inner planets
  11. An ________________ is an imaginary line around which a planet rotates.
    axis
  12. The five planets that are farthest from the sun are called the________________.
    outer planets
  13. The moon seems to have different _____________________ as it orbits around the Earth.
    phases
  14. A ________________________ is a vehicle sent into space in order to explore places too dangerous or too far away for people to visit.
    Space probe
  15. A large object that moves around a star is a _______________.
    planet
  16. Planets that are large spheres made up mostly of gases are called _________________________.
    gas giant
  17. Name the inner planets
    Mercury Venus Earth and Mars
  18. Name the outer planets
    Jupiter, Saturn, Uranus, Neptune, and Pluto
  19. Name the planets in order from the sun
    Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto
  20. Compare planets, comets and asteroids
    They all revolve around the sun

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