How do changes in light wavelengths support the idea that the universe is expanding?

A. Light from other galaxies shifts toward the blue end of the spectrum, which shows that the galaxies are moving away from Earth.

B. Light from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving away from Earth.

C. Light from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving toward Earth.

D. Light from other galaxies shifts toward the blue end of the spectrum, which shows that the galaxies are moving toward Earth.

Question

Physics

Fernanda Manning

28 August, 02:17

How do changes in light wavelengths support the idea that the universe is expanding?

A. Light from other galaxies shifts toward the blue end of the spectrum, which shows that the galaxies are moving away from Earth.

B. Light from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving away from Earth.

C. Light from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving toward Earth.

D. Light from other galaxies shifts toward the blue end of the spectrum, which shows that the galaxies are moving toward Earth.

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Answers (1)

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Trent Lindsey · Answer 1

As per the Doppler's Effect

B. Light from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving away from Eart