REDSHIFT - The stretching of light toward the red part of the spectrum showing that galaxies are moving away., BIG BANG THEORY - The theory stating that the universe began from a hot, dense, and tiny point., COSMIC MICROWAVE BACKGROUND RADIATION (CMBR) - The faint energy left over from the early universe that supports the Big Bang Theory., EDWIN HUBBLE - The astronomer who discovered that galaxies move away from each other, proving the universe is expanding., AGE OF THE UNIVERSE - Estimated to be about 13.8 to 14 billion years old based on scientific observations.,

2. GENERALIZATION

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