RED SHIFT
Shift toward longer wavelengths of spectral lines emitted by a celestial object caused by object moving away from earth, important piece of evidence for Big Bang Theory
BLUE SHIFT
Shift toward shorter wavelengths of spectral lines emmited by a celestial object that is caused by object moving toward earth
SPECTRA
Lines of light that can tell you the composition of a star or galaxy
BIG BANG THEORY
Theory the universe began as a small point that expanded rapidly about 13.82 billion years ago
HYDROGEN
Main element formed in the Big Bang
COSMIC BACKGROUND RADIATION
Weak radiation that is left over from early, hot stages of expansion of universe
SINGULARITY
A point of infinite density that contained all of the matter, space, and time of the universe
DOPPLER EFFECT
An observed change in the frequency of a wave when the source or observer is moving
GALAXY
Huge group of single stars, star systems, star clusters, dust and gas bound together by gravity
UNIVERSE
All observable items, including galaxy clusters, galaxies, stars and planets
NEBULA
Large cloud of dust and gas in space
SCIENTIFIC THEORY
An explanation for a natural event, based on multiple lines of evidence, with supporting claims.