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Big Bang theory
A model of the universe in which space has been expanding from a very hot, very dense early state, leading to the cooler, structured universe observed today.
Cosmic microwave background (CMB)
Electromagnetic radiation filling space, observed today mainly as microwaves, interpreted as cooled and stretched light released when the early universe became transparent.
Doppler effect
The Doppler effect is the change in observed wavelength or frequency of a wave due to relative motion between the source and the observer.
Hubble’s law
Hubble’s law states that the speed at which a galaxy moves away from us is proportional to its distance from us.
Red shift
Red shift is the increase in wavelength of light from an object moving away from the observer.
Scientific Model
A representation of a system or process used to explain observations and make predictions, often with known limitations.