Unformatted text preview: brightness that it creates by emitting light. Stars generally come inside a group of stars called a star cluster, which is pretty much just a small group of stars with the same birth period in a small volume of space. Taking pictures of these star clusters allows astronomers to learn about stellar evolution and the lifetime of different stars. After photos have been taken and photometry has been applied, astrometry is used to measure the positions of stars to determine how they move and how they are related to surrounding bodies in space. Consequently, a good CCD camera is needed in order to perform accurate measures of astrometry. Astrometry uses angular separations and position angles to determine where a star is in relation to the other stars in its star cluster. This allows an astronomer to see which objects are rotating and how they are rotating....
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- Fall '07
- Astronomy, astronomy lab, CCD cameras