Spectroscopy is a technique based on the emission and absorption of radiations. In space, the technique provides information on composition and temperature. Thus, options B and D are correct.
What is spectroscopy?
Spectroscopy uses electromagnetic spectra to measure and analyze matter based on the absorption and emission of radiations with specific wavelengths or frequencies.
It is used in space to determine the composition and temperature of the celestial body and astronomical objects as they absorb and emits a certain range of length from the electromagnetic spectrum.
Therefore, in options B and D. the composition and temperature can be determined by spectroscopy.
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