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  • Comparing stars - LearningSpace - OpenLearn - The Open University - Stars can necessarily be observed only at a distance. This unit introduces the Hertzsprung–Russell diagram, an essential tool in understanding the nature of stars. You should have some understanding of the basic stellar properties of luminosity and temperature in order to get the most from the unit
  • Star (astronomy) - MSN Encarta - Star astronomy, massive shining sphere of hot gas. Of all the stars in the universe, our Sun is the nearest to Earth and the most extensively
 

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