Unformatted text preview: Through spectroscopy, one call tell how far away an object is (distance) through the use of a process called spectroscopic parallax. This is done through analyzing the luminosity and the spectral class. Luminosity is found by looking at the widths of its spectral lines. Absolute and apparent magnitudes are contrasted to find the distance of the object. Motion can be determined using the Doppler effect. The Doppler effect is the apparent change in the wavelength of radiation caused by the motion of the source. Temperature can be found out through the observation of spectral lines.  http://en.wikipedia.org/wiki/Astronomical_spectroscopy...
View Full Document
- Spring '08
- Light, Electromagnetic spectrum, spectral lines, opaque outer-most layer