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How it was discovered:
Edwin Hubble did further investigations, estimates on study of distances to galaxies.
The same time-
Lowell Observatory in Arizona, Vesto Slipher- using “Doppler Effect” to determine rate of brightest galaxies moving to or away from us.
1929- Hubble combined the 2:
1) His distance estimates
2) Slipher’s velocity estimates
Reached a startling conclusion, became his most famous and astounding discovery.
THE UNIVERSE IS EXPANDING
‘Vast regions of space between galaxies are expanding’
All galaxies moving away from us.
Speed increase proportionally to galaxies distance.