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Planck
The Discovery of the Cosmic Microwave Background
Planck superimposed on a simulated false-colour map of the CMB. (Image: ESA  D. Ducros; background ESA)
Edwin Hubble at the 100-inch telescope at Mt. Wilson.
The first clue that the universe was expanding was Edwin Hubble's discovery of the red shifts of galaxies, which he annouunced to the world in 1929.

Using the 100-inch telescope at Mt. Wilson in California, Hubble found that galaxies that are moving away from us have the wavelengths of their light stretched toward the red, or longer, end of the electromagnetic spectrum.

Spectal lines in the light from distant galaxies are shifted more to the longer wavelengths
Hubble found that spectral lines in the light from distant galaxies are shifted toward the red (longer wavelength) end of the electromagnetic spectrum.


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