The Big Bang
The Big Bang introduces students to essential astronomy ideas through observation, evidence, vocabulary, and real examples.
The Early Universe
The Big Bang model describes an early hot, dense state followed by expansion and cooling. It is not an explosion into empty space; it is the expansion of space itself.
Evidence
The strongest evidence includes expanding galaxies, the cosmic microwave background, and the measured abundance of light elements such as hydrogen and helium.
Did You Know?
The Big Bang connects to everyday science because the same laws of motion, energy, and matter apply on Earth and across space.
Knowledge Check
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