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09 uni 09

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09 uni 09 09 uni 09 Presentation Transcript

  • MotionMotion is referred to as eitherReal or Apparent.
  • MotionDoes these pictures showreal motion or apparent motion?
  • MotionDoes these pictures showreal motion or apparent motion?
  • MotionDoes these pictures showreal motion or apparent motion?
  • MotionApparent motion – what we see in the night sky.Does not always represent how the observedobject is actually moving.Real motion – How an object is actually moving.
  • BrightnessThe magnitude of an objects brightness can bereferred to as eitherAbsolute or Apparent.
  • Brightness (Temperature)
  • BrightnessApparent magnitude ranks stars by how brightthey look from Earth.The brightest star (Sol) is -27, and the dimmest staris 36.
  • BrightnessAbsolute magnitude ranks stars by how brightthey would look if they were all equal distances(33 ly) away from Earth.The brightest star is -13, and the dimmest star is 15 (Temperature)