2.3 Origin of the Universe
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8 Terms
Absorption Lines
A pattern of lines in the spectrum that occur due to gases absorbing particular wavelengths of colors; every gas has a unique pattern of lines.
Big Bang Theory
Explains how the universe began with an infinitely hot and dense single point that inflated to form the ever-expanding cosmos we see today.
Cosmic Microwave Background Radiation
Microwave radiation that fills all space in the observable universe. It is a remnant of the energy leftover from the big bang.
Doppler Effect
The change in the frequency of a wave due to the relative motion between the wave source and the observer.
Frequency
The number of waves that pass a fixed point in a unit of time.
Gravity
A force of attraction between objects that have mass.
Velocity
Another word for speed.
Wavelength
The distance between two adjacent waves.
Note 
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