Using the Doppler effect, astronomers can
A)calculate the velocity Earth's moon is moving toward Earth.
B)calculate the distance from Earth to the Moon.
C)detect whether a celestial object is moving away or towards the observer.
D)detect a celestial object's chemical composition.

Question

Quizplus · Accepted Answer

The Doppler effect can be used to detect whether a celestial object is moving away or towards the observer by analyzing the shift in wavelength of the light emitted by the object. This is known as the redshift or blueshift, depending on whether the object is moving away from or towards the observer, respectively.

Using the Doppler Effect, Astronomers Can