Astrophysics, Cosmology & Relativity

4 terms

The relativistic effect where an object's length in the direction of motion is measured shorter by a stationary observer than its proper…

An astronomical unit of length equal to the distance light travels in a vacuum in one Julian year (365.25 days).

The small galaxy cluster group comprising the Milky Way, Andromeda (M31), Triangulum (M33), and over 80 dwarf satellite galaxies.

The fundamental relativistic factor by which time dilation, length contraction, and relativistic mass scale for objects moving at velocity…