Space- Chapter 7

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Author:
AmandaBall
ID:
262100
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Space- Chapter 7
Updated:
2014-03-18 15:37:23
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Space
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Space- Chapter 7
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  1. Celestial Objects
    Any object that exists in space such as planets, a star, or the Moon
  2. Astronomer
    A scientist who studies astronomy
  3. Revolution
    The time it take for an object to orbit another object
  4. Rotation
    The turning of an object around an imaginary axis running through it
  5. Constellation
    A group of stars that seem to form a distinctive pattern in the sky
  6. Light-Year
    The distance light travels in one year, about 9.5x10 to the power 12
  7. Apparent magnitude
    The brightness of a star as seen from Earth
  8. Asterism
    A smaller group of stars that form patterns within a constellation
  9. Tides
    The rising and falling of oceans waters caused by the Moon's and Earth's gravity
  10. Lunar eclipse
    the phenomenon in which the full Moon passes into Earth's shadow
  11. Solar Eclipse
    The phenomenon in which the shadow of the moon falls on earth's surface
  12. Solar system
    A group of planets that circle on or more stars
  13. Retrograde motion
    The movement of an object in the sky, usually a planet, from east to west, rather than normal motion west to east; this effect s generally produced when Earth is passing the planet in its orbit
  14. Astronomical unit (AU)
    The average distance from earth and the sun about 150x10 to the power 6 km
  15. Orbital Radius
    The average distance between the sun and an object that is orbiting the sun
  16. Geocentric model
    A model of the solar system stating that Earth is the centre of all planetary motion, with planets and the Sun travelling in perfect circles around the Earth
  17. Heliocentric model
    A model of the solar system in which the Sun is the centre with the planets orbiting it
  18. Comet
    An object composed of rocky material, ice, and gas; comes from the Kuiper Belt or Oort Cloud
  19. Asteroid
    An object in space that ranges in the size from a tiny speck, like a grain of sand, to 500km wide; most asteroids originate in the astroid belt in between Mars and Jupiter
  20. Meteoroid
    A piece of rock moving through space
  21. Meteor
    A meteoroid that hits earths atmosphere and burns up
  22. Trans-Neptunian objects
    An object that circles the Sun beyond the orbit of Neptune
  23. Pointer Stars
    The Big Dipper's two end stars are called pointer stars because they point towards Polaris
  24. Circumpolar
    Constellations that are visible all year round
  25. Zenith
    Constellations that you would see if you looked strait up
  26. Phases of the moon
    First Quarter, waxing gibbous, full moon, waning gibbous, third quarter, waning crescent, new moon, waxing crescent. Counter clockwise
  27. Why do we have seasons?
    The seasons are a result of the Earths rotation around the sun and the rotation around around its tilted axes
  28. Planets
    • Inner- Mars, Venus, Earth, Mercury,
    • Outer- Jupiter, Saturn, Uranus, Neptune
  29. Mercury
    Has no atmosphere. Only slightly larger that our moon
  30. Venus
    Sulfur mixes with moisture in Venus's atmosphere. Also contains carbon dioxide and nitrogen
  31. Earth
    Nitrogen oxygen and water vapor
  32. Mars
    • Carbon dioxide
    • has iron in its surface rock which is what make it look red
  33. Jupiter
    • Largest planet
    • atmosphere is made of hydrogen and helium
  34. Saturn
    • Atmosphere is hydrogen and helium
    • Its rings are ice particles. They are about 250,000 but can be as thin as 10m
  35. Uranus
    • Blue-green colour comes from the methabe gas in its atmosphere. It's atmosphere also contains hydrogen and helium.
    • appears to be tilted in its side
  36. Neptune
    • Last planet
    • atmosphere contains hydrogen, helium, and methane

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