What evidence is there that the universe is expanding?

timer Asked: May 11th, 2014
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Question Description

What evidence is there that the universe is expanding?

Tutor Answer

School: Rice University

 The strongest evidence for an expanding universe comes from the cosmological redshift. A redshift is a change in the spectrum of light as the distance between the source and the observer of the light increases. Such a redshift has been seen in the spectrum of light from distant stars. This means that the distance between those stars and the Earth is increasing, indicating an expanding universe

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