Final answer:
Spectra of stars can be analyzed to deduce chemical and physical data such as chemical composition, temperature, pressure, and motion.
Step-by-step explanation:
Spectra of stars can be analyzed to deduce chemical and physical data.
By examining the spectrum of a star, astronomers can determine its chemical composition, temperature, pressure, and motion. The spectrum provides information about the elements present in the star's atmosphere, with each element producing a unique pattern of spectral lines.
By comparing these lines to known atomic spectra in laboratories on Earth, astronomers can identify the elements in the star, even in distant galaxies.