1. Discovery of the Expanding Universe
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Discovery of the Expanding Universe
1929 Edwin Hubble estimated the distance to 46 Galaxies.
Discovered all galaxies were red-shifted
This means they were all moving away from earth
The furthest away were moving the fastest…the closest galaxies were moving slower
This became known as HUBBLES LAW

2. Determining the Beginning of Time
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Determining the Beginning of Time
Origin of Matter
Big Bang theory
15-20 billion years ago
Universe is expanding therefore it must have started off small and dense
Echos of the Big Bang
1960 microwave antenna kept detecting background noise
Picking up radiation given off by original Big Bang event