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the universe

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  • What is latitude?
    the distance from any point to the equator.
  • when did life on earth begin?
    around 2 billion years ago
  • groups of celestial bodies are called?
    galaxies
  • What are the three characteristics that make earth different?
    moderate temperature, oxygenated atmosphere, abundance of liquid water
  • how many natural satellites does the earth have?
    one, the moon.
  • what are planetary systems?
    a star and all the bodies that orbit around it
  • What consequences does the earth's orbit around the sun have combined with its tilted axis of reversal?
    different seasons
  • why do we have time zones?
    to make sure the time matches up with the amount of light that part of the earth is recieving.
  • how did the universe form?
    as a result of the big bang
  • what is an atmosphere?
    a layer of gases that sorround an astronomical object
  • What is a geoid shape?
    an imperfect sphere.
  • what are meridians?
    imaginary semicircles that go from one pole to the other, used for navigation.
  • why are the tropics so hot?
    the sun's rays strike the earth nearly perpendicular, concentrating the heat
  • Why is the earth's rotation necessary for life?
    without it, half of the planet would be too hot and half would be too cold
  • what is the universe made up of?
    stars, celestial bodies, interstellar matter, and empty space
  • how long ago was the earth formed
    around 4.6 billion years ago
  • how long does it take for the earth to complete one full rotation?
    23 hours and 56 minutes
  • what is longitude?
    the distance from any point on earth to the prime meridian.
  • What are parallels?
    imaginary circles that run perpendicular to the earths axis of rotation, used for navigation
  • What is scale?
    the relationship between the distance measured on a map and the distance in real life
  • which way does the earth rotate
    eastward, or counterclockwise from the north pole
  • Why does the earth look blue when viewed from outer space?
    all the liquid water on the surface
  • What does the earth orbit around?
    the sun
  • What is the surface  of the earth?
    510 million kilometers squared
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