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The galaxy in which we are situated.
A debate about the size and structure of the Universe
The Curtis-Shapley Debate
That the Universe was just one huge galaxy measuring 100,000 parsecs, and that our Solar System was far from the centre. He also argued that nebulae were relatively nearby
That the Universe was made up of many galaxies which we were at the centre of. He also believed that nebulae were very distant.
Possibly the most famous astronomer ever - settled the Curtis-Shapley debate.
The change of light wavelengths as galaxies move further away, moving their colour further to the red side of the spectrum.
Hubble constant times distance equals speed of recession