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Vesto Slipher
Vesto was the first to find and actually observe data the proved nebulas are moving away from everything (dis proved the static state theory) -
George Lemaitre
George Lemaitre Discovered an expanding universe by observing red shifts in the spiral nebula -
Edwin Hubble
Edwin provided comprehensive Observational foundation for Lemaitre's Theory. -
Beginning of the Theory
Lemaitre Proposed a hypothesis for a universe began with a explosion of primeval atom later called the big bang theory -
Period: to
Big Bang vs Steady state
Both theory's had evenly divided support. steady state means universe is always at the same point its at now.
Big bang means universe is always at a constant rate of expanding. -
Hubble
The Hubble Telescope launched and gave astronomers a chance to have untainted/distorted pictures of deep space