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Details Title: Astronomy Book Vocabulary Description: Chapter 3/Sections 1&2 Total Flash Cards: 14 Created: 07/05/2005 06:32:41	To study from this set of flash cards, or to create your own your own study flash cards, register HERE. If you are already a registered user, CLICK HERE.
Cards Term constellation Definition a pattern of stars in the sky Term visible light Definition electromagnetic radiation that can be seen with the unaided eye Term electromagnetic radiation Definition energy that travels through space in the form of waves Term wavelength Definition the distance between the crest of one wave and the crest of the next wave Term spectrum Definition the range of wavelengths of electromagnetic waves Term galaxy Definition a giant structure that contains hundreds of billions of stars Term universe Definition all of space and everything in it Term light-year Definition the distance that light travels in one year Term parallax Definition the apparent change in position of an object when seen from different places Term giant star Definition a very large star, much larger than the sun Term apparent magnitude Definition the brightness of a star as seen from Earth Term absolute magnitude Definition the brightness of a star if it were a standard distance from Earth Term Hertzsprung-Russell diagram Definition a graph relating the temperature and brightness of stars Term main sequence Definition an area on the Hertzsprung-Russell diagram that runs from the upper left to the lower right and includes more than 90 percent of all stars