A spectroscope or a spectrometer is an instrument which is used for separating the components of light into different
wavelengths. Astronomers often use spectroscopes and the resulting emission spectra to
identify elements found in distant stars.
determine how fast an object is moving.
determine relative distances in space,
D)
identity dark matter and black holes

the answer is b

B

Explanation:

affirmative action refers to the policies that take gender, race, or ethnicity into account in order to promote equal opportunity.

employers subject to title vii are prohibited from taking race or sex into account in any employment decisions. aa is a penalty for having any job group substantially statistically "underutilized" in any race or either sex. the employer must take steps to eliminate the underutilization, then stop, ending its aa efforts