Unformatted text preview: magnitudes because both can look as bright. 7. Yes two stars can have the same absolute magnitudes but different apparent magnitudes. This can happen when the two stars are different distances from Earth, one being further than the other. 8. The star's apparent magnitude measures the brightness of a star as it appears to us here on Earth. A dim, close star will have a higher apparent magnitude then a bright, distant star. In reality, the bright, distant star has a higher energy output. So a star’s apparent magnitude is not a good indication of the star’s energy output. 9. Astronomers can estimate the chemical compositions of stars by looking at their spectrum. Each element has a different set of absorption lines in the spectrum. Each wavelength which can be measured and the absorption line at the given wavelength in a stellar spectrum shows that the element must be present....
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This note was uploaded on 10/25/2009 for the course PHYSICS Astronomy taught by Professor Me during the Spring '09 term at Akademia Ekonomiczna w Krakowie.
- Spring '09
- Quantum Physics