This is analogous to the second law of thermodynamics, with the surface areas of the black holes being a measure of the entropy of the system. Perfect absorbers must also be perfect radiators. See also Doppler effect . A constant which describes the relationship between temperature and kinetic energy for molecules in an ideal gas. He died in 1601 of a burst bladder because court etiquette prohibited him from leaving the table before his host was finished.
Radiation is emitted when charged particles are accelerated.
In this case, the acceleration is caused by the electromagnetic fields of the atomic nuclei of the medium. This procedure removes most of the errors caused by environmental and instrumental instabilities. Cepheid variable A type of variable star which exhibits a regular pattern of changing brightness as a function of time. The period of the pulsation pattern is directly related to the star's intrinsic brightness. Thus, Cepheid variables are a powerful tool for determining distances in modern astronomy.