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
- This is pulled together by gravity
- Hydrogen gas and dust in space
- 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
- The Birth of a star:
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