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Earth's place in the Universe

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  • How long does it take for the Earth to complete one revolution?
    365 days (1 year)
  • If mass increases what happens to gravity?
    Gravity increases
  • If distance increases what happens to gravity?
    Gravity decreases.
  • Which type of tides has the biggest changes in daily tides?
    Spring Tides
  • What are the 2 factors that affect gravity?
    Mass and Distance
  • How does a lunar eclipse occur?
    Earth is between the sun and moon.
  • How are all galaxies formed?
    Gravity
  • Which object has a bigger affect on the tides and why?
    The moon because its closer.
  • What is it called when Earth travels around the Sun?
    Revolution
  • If the sun was smaller and had less gravitational pull what would happen to Earth's orbit?
    It would increase and take longer to complete an orbit.
  • Which factor determines the length of time it takes a planet to orbit the sun?
    It's distance from the sun. Closer to the sun- shorter.
  • How does a solar eclipse occur?
    The moon is between the sun and Earth.
  • What 2 things would happen if the Earth doubled its size?
    It would have more gravitational pull and it would be closer to the sun.
  • What causes Earth to have seasons?
    Earth is tilted 23.5 degrees
  • How many days does a moon phase last?
    3-4 days (closer to 3)
  • Where will you experience the least amount of change in day light?
    Near the equator
  • If the moon moved farther away from Earth how would that affect the gravitational pull?
    Earth would have less gravitational pull on the moon.
  • Why don't we have an eclipse every month.
    The moon's orbit is not always in the same plane as Earth's orbit.
  • Where will you experience midnight sun and polar nights?
    Near the poles
  • Why is the sun the center of the galaxy?
    It is the biggest and has the most gravitational pull.
  • What makes a planet a planet? (must name at least 2 reasons)
    It must orbit a star (the sun), must have enough gravity to be round and to clear a path in its orbit.