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Site pages
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Current course
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Participants
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General
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Topic 1
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Topic 2
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Topic 3
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Topic 4
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Topic 5
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Topic 6
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Topic 7
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Topic 8
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Topic 9
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Topic 10
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Topic 11
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Topic 12
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Topic 13
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Topic 14
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Topic 15
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Topic 16
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Topic 17
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REVIEW: Lesson Summary
![[~]/sombero_galaxy_revised.jpg](/pluginfile.php/5414/mod_page/content/1/sombero_galaxy_revised.jpg "[~]/sombero_galaxy_revised.jpg")
Picture of the Sombrero galaxy. Photo courtesy of HST/NASA/ESA. Public
domain.
- Scientific notation is a way to format numbers. Example: 4.35 x 106
- Redshift is calculated with the following formula:
![[~]/redshift_equation.JPG](/pluginfile.php/5414/mod_page/content/1/redshift_equation.JPG "[~]/redshift_equation.JPG")
- Recent evidence shows that there is a lot of matter in the universe that we cannot detect directly. This matter is called dark matter.
- The rate of the expansion of the universe is increasing. The cause of this increase is unknown; one possible explanation involves a new form of energy called dark energy.
Last modified: Saturday, 24 April 2010, 7:59 PM