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How are the expanding universe and the Doppler effect related to one another?

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luluxs | Student, Grade 9 | eNotes Newbie

Posted October 22, 2008 at 8:59 AM via web

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How are the expanding universe and the Doppler effect related to one another?

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james0tucson | (Level 2) Adjunct Educator

Posted October 22, 2008 at 1:29 PM (Answer #1)

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The Doppler Effect is evidence that the universe is expanding.  When stars or galaxies are moving away from us, we see their color as red shifted. Because the distant galaxies are red shifted, this means that they are all receding with respect to Earth.  In the theory of Special Relativity, Albert Einstein predicted that spacetime itself is expanding. 

The observation of the Doppler Effect on light was a problem for physics because the frequency of light does not change.  Einstein's famous conclusion was that time was changing with respect to gravity, while the velocity of light remained constant.

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astrosonuthird | Student | (Level 1) Valedictorian

Posted August 21, 2012 at 11:25 AM (Answer #2)

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Yes! It is correct!

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astrosonuthird | Student | (Level 1) Valedictorian

Posted August 21, 2012 at 11:26 AM (Answer #3)

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Hello enotes users.

 

Andromeda galaxy and Milky Way galaxy is coming closer and the universe is expanding.

 

 

Will it crash!!!!!!!!!!

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