Multiple Choice Please select the best answer and dick submi

Multiple Choice: Please select the best answer and dick \"submit.\" How do changes in light wavelengths support the most widely accepted ideas about the universe? A. Galaxies are moving toward Earth, as shown by the shift of their light toward the blue end of the spectrum. B. Galaxies are moving away from Earth, as shown by the shift of their light toward the red end of the spectrum. C. Galaxies are moving away from Earth, as shown by the shift of their light toward the blue end of the spectrum. D. Galaxies are moving toward Earth, as shown by the shift of their light toward the red end of the spectrum.

Solution

Redshift and blueshift describe how light changes as objects in space (such as stars or galaxies) move closer or farther away from us. The concept is key to charting the universe\'s expansion.

Visible light is a spectrum of colors, which is clear to anyone who has looked at a rainbow. When an object moves away from us, the light is shifted to the red end of the spectrum, as its wavelengths get longer. If an object moves closer, the light moves to the blue end of the spectrum, as its wavelengths get shorter.

So, the answer is B