Astrophysics terms

Astrophysics terms include the following major studies:


 * Astrometry — The branch of astronomy concerning the accurate measurement of the positions and proper motions of celestial objects.
 * Spectroscopy — is the study of the interaction between matter and electromagnetic radiation.
 * Photometry — is a technique of astronomy concerned with measuring the flux, or intensity of an astronomical object's electromagnetic radiation.
 * Variable stars concerns the fluctuation of a star's apparent magnitude (brightness).
 * Stellar longevity concerns the life processes of a star and how it changes over the course of time, depending on its mass.