Science - Unit 1 Space Chapter 7

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Science - Unit 1 Space Chapter 7
2014-02-20 20:56:53
Grade Science Space

Flash cards for Science, Space unit, Chapter 7
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  1. Astronomer
    scientist who studies astronomy (7.1)
  2. Celestial object
    any object that exists in space (7.1)

    i.e. planets, stars
  3. Rotation
    the turning of an object around an imaginary axis running though it (7.1)

    eg. Earth's rotation around its axis is 24h
  4. Revolution
    • the time it takes for an object to orbit another object (7.1)

    eg. Earth's revolution around the Sun is 365.24 days
  5. Apparent magnitude
    the brightness of a star as seen from Earth (7.2)
  6. Absolute magnitude
    the brightness of a star from equal distances,

    Measured on a stellar magnitude scale which goes from -26 (Sun) to over 6 in magnitude
  7. Asterism
    a smaller group of stars that form patterns within a constellation (7.2)

    e.g. Orions's belt in Orion
  8. Circumpolar
    Constellations that are visible all year round (7.2)
  9. Constellation
    a group of stars that seem to form a distinctive pattern in the sky (7.2)

    i.e. Orion, Ursa Major, etc.
  10. Light-year
    the distance that light travels in one year, about 9.5 trillion km (7.2)
  11. Pointer stars
    • stars that are used to pinpoint other areas or constellations in the sky (7.2)
  12. Zenith
    Constellations you would see if you looked straight up (7.2)
  13. Lunar eclipse
    the phenomenon in which the full Moon passes into Earth's shadow (7.3)
  14. Solar eclipse
    the phenomenon in which the shadow of the Moon falls on Earth's surface (7.3)
  15. Phases of the Moon
    • the monthly progression of changes in the apperance of the Moon that result from different portions of the Moon's sunlit side being visible from Earth (7.3)
  16. Tides
    the rising and falling of ocean waters caused by the Moon and Earth's gravity (7.3)
  17. Astronomical unit
    the average distance between Earth and the Sun, about 150 million km (7.4)
  18. Geocentric model
    • a model of the solar system stating that Earth is the centre of all planetary morion, with the planets and the Sun travelling in perfect circles around Earth (7.4)
  19. Heliocentric model
    a model of the solar system in which the Sun is in the centre with the planets orbiting it (7.4)
  20. Planet
    an object that orbits one or more stars (and is not a star itself), is spherical and does not share its orbit with another object (7.4)

    eg. Earth, Mars, Jupiter, etc.
  21. Inner planet
    a planet who's orbit lies within the asteroid belt (7.4)

    e.g. Earth, Mars, etc.
  22. Outer planet
    A planet who's orbit lies outside of the asteroid belt (7.4)

    e.g. neptune, saturn, etc.
  23. Earth
    third planet from the sun, the densest planet in the solar system and is made up of 3/4 water, inner planet (7.4)
  24. Jupiter
    it is the fifth and largest planet in the solar system, outer planet, it is a gas giant (7.4)
  25. Mars
    fourth from the sun and second smallest planet in the solar system, inner planet, mostly made of iron with thin athmosphere (7.4)
  26. Mercury
    smallest and closest to the sun, surface has immense cracks and wide ranges in temperature, inner planet (7.4)
  27. Neptune
    outermost planet and the third most massive, thin ring made of ice particles, dark blue colour, outer planet (7.4)
  28. Saturn
    large rings made of ice particles, mainly composed of hydrogen and helium, sixth from the sun and second largest, outer planet (7.4)
  29. Uranus
    fourth largest, gas giant, seventh from the sun, has thin ring and is flipped on side so rolls through orbit, outer planet (7.4)
  30. Venus
    second planet from the sun, sulfuric acid rain in athmosphere, significantly hot, inner planet (7.4)
  31. Retrograde motion
    • the movement of an object in the sky (usually a planet) from east to west, rather than its normal motion from west to east; this effect is generally produced when Earth is passing a planet in its orbit (7.4)
  32. Solar system
    a group of planets that circle one or more stars (7.4)
  33. Orbital radius
    the average distance between the Sun and an object that is orbiting the Sun (7.4)
  34. Asteroid
    an object in space that ranges in size, most asteroids originate in the asteroid belt between Mars and Jupiter  (7.5)
  35. Comet
    an object composed of rocky material, ice and gas; comes from the Kuiper Belt or Oort Cloud (7.5)
  36. Meteorite
    is a meteoroid that is large enough to pass through Earth's atmosphere and reach the ground without being totally burned up (7.5)
  37. Meteor
    a meteoroid that hits Earth's atmosphere and burns up (7.5)
  38. Meteoroid
    a piece of rock moving through space (7.5)
  39. Trans-Neptunian object
    an object that circles the Sun beyond the orbit of Neptune (7.5)