What instrument records light frequencies from space and tells us composition of objects?

The instrument that records light frequencies from space and analyzes the composition of objects is called a spectrometer. It measures the spectrum of light emitted, absorbed, or scattered by materials, allowing scientists to identify the chemical elements and compounds present. By examining the specific wavelengths of light, spectrometers can provide insights into the physical properties and processes of celestial objects. This technique is widely used in fields such as astronomy and planetary science.