p1 continued

  • Created by: lisa
  • Created on: 19-12-12 20:20
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  • P1 The Earth in the universe
    • The Birth of a star:
      • Hydrogen gas and dust in space
        • This is pulled together by gravity
          • If there is enough force the nuclei start to fuse
    • Scientists use two ways to work out the distances of stars from earth:
      • 1.The can look at the relative brightness of the stars
      • 2.They can use parallex(a near star will shift its position against the background of more distant stars)
    • A light year is the distance travelled by light in one year
    • The redshift hotter stars have more red in their spectrum
    • The big bang theory explains how the universe was once a very hot dense tiny mass that exploded


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