Why do astronomers utilize spectroscopy to analyze distant galaxies?
Answer
To identify chemical elements through their unique spectral barcodes
Spectroscopy is a technique that splits incoming light to reveal the chemical composition of an object. Different elements, such as hydrogen, oxygen, and helium, absorb and emit light at specific, known wavelengths, creating a unique barcode or fingerprint. By observing where these lines appear, astronomers can determine the chemical makeup of a galaxy and measure how much those lines have been shifted from their rest position, which indicates the degree of redshift.
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