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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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STUDY: Vocabulary
![[~]/cluster_of_stars_goddard_photo_and_video_blog_revised.jpg](/pluginfile.php/5413/mod_page/content/1/cluster_of_stars_goddard_photo_and_video_blog_revised.jpg "[~]/cluster_of_stars_goddard_photo_and_video_blog_revised.jpg")
The star cluster Omega Centauri, which is about 16,000 light-years from Earth.
Photo courtesy of Goddard Photo and Video Blog. CC BY.
Photo courtesy of Goddard Photo and Video Blog. CC BY.
Big Bang Theory: The hypothesis that all matter and energy were at one time compresses into a very small volume; then there was an explosion that sent everything moving outward, causing the universe to expand.
Dark energy: An as yet undiscovered form of energy that we cannot see.
Dark matter: Matter in the universe that doesn't emit light.
Redshift: Shift of wavelengths of light towards the red end of the spectrum; happens as a light source moves away from us.
Scientific Notation: A way to format numbers, especially large ones. Example: 3.29 x 106
Universe: Everything that exists; all matter and energy; also includes all of space and time.
WIMP: Weakly Interactive Massive Particles. A type of particle that doesn't affect other matter, except through gravity. May or may not actually exist.
Last modified: Saturday, 24 April 2010, 7:59 PM