Last years Nobel prize winner in Physics, John Mather, Swarthmore alumni, gave a lecture on “From the Big Bang to the Nobel Prize and on to the James Webb Space Telescope.” He described how astronomers measure galactic distances, like distance between galaxies, stars and black holes. Concept used is called Doppler effect. In our daily life we experience it when the sound of a car moving away from us becomes less audible. Even if you do not "see" the car moving away you can judge just by the sound that the car is moving away from you.
Same concept is used by astronomers when they measure that the light being emmited from a distance star is becoming dimmer, the faster the light becomes dimmer, the faster must be the star moving away from us.
Labels : doppler shift, cosmology, billie jean, new world, diana ross señal digital, james clerk maxwell, espectro electromagnetico, hans christian oersted, michael faraday
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