Cosmic Distance Ladder – Part 4 of 4

The final part of the Cosmic Distance Ladder series.

How I See It

On March 15,1929, Edwin Hubble presented a paper to the National Academy of Sciences. A Relation Between Distance and Radial Velocity Among Extra-Galactic Nebulae stated that the 24 objects he studied were receding from Earth in a specific pattern. The farther ones were receding faster. In fact, the distance vs recessional velocity was a linear direct proportion. This finding has had profound consequences on our understanding of the nature of the universe, when it originated, how large it is, and what future course it will take.

This is the final part of the series Cosmic Distance Ladder. Here are links to part 1part 2, and part 3. As promised, the arguments and information will be presented as conceptually as possible without emphasis on the mathematical details. The goal of this series has been to assist the non-technically trained reader to understand more about how we…

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