What instrument is used to study light from stars?

Scientists use an instrument called a spectroscope or spectrometer to study the light from stars. This tool separates starlight into its different colors, or spectrum, just like a rainbow. By studying this spectrum, scientists can learn what elements a star is made of, how hot it is, how fast it’s moving, and even if it has planets. The Hubble Space Telescope and other space observatories use advanced versions of spectrometers to study distant stars and galaxies. This helps astronomers understand the universe’s composition and the life cycles of stars.