A method for finding distance based on that shift. For example, orbital period is the time it takes a planet or star to complete an orbit. That is, the part of its motion directly toward or away from the observer. A star's spectral class is based on the appearance of its spectrum lines. This method is based on constructing a triangle, one side of which is the distance to be determined.
White dwarfs burn no nuclear fuel and shine by residual heat.
They are the end stage of stellar evolution for stars like the Sun. The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use and Privacy Policy .