Statics is the action of one body on another. A force is either a push or a pull. A force tends to move a body in the direction of its action. The action of a force is characterized by its magnitude, by the direction of its action, and by its point of application. Thus, force is a vector quantity, because its effect depends on the direction as well as on the magnitude of the action. Forces are classified as either contact or body forces. A contact force is produced by direct physical contact; an example is the force exerted on a
Absolute magnitude local objects, a K correction might have to be applied to the magnitudes of the distant objects. The absolute magnitude can also be approximated using apparent magnitude and stellar parallax : or using apparent magnitude and distance modulus : Rigel has a visual magnitude of 0.12 and distance about 860 light-years Vega has a parallax of 0.129″, and an apparent magnitude of 0.03 Alpha Centauri A has a parallax of 0.742″ and an apparent magnitude of −0.01 The Black Eye Galaxy has a visual magnitude of 9.36 and a distance modulus of 31.06 The bolometric magnitude , takes into account