Spectroscopy
Spectroscopy is the study of how Matter interacts with Energy, typically Light, revealing the identity and structure of substances through analysis of their Reflection, absorption, and emission patterns.
When light passes through or bounces off a substance, it carries a fingerprint of that material's atomic and molecular composition. By splitting this light into a spectrum—like a prism creating a rainbow—scientists can identify chemical elements, measure temperatures of distant stars, and understand the fundamental structure of matter.
The technique emerged from Newton's prism experiments and has become indispensable across disciplines. Astronomers use spectroscopy to determine the composition and classification of stars and measure the expansion of the universe. Chemists employ it to detect substances at vanishingly small concentrations. Biologists use Magnetic resonance spectroscopy to map protein structures.
Different types probe different phenomena: atomic spectroscopy reveals individual electrons; molecular spectroscopy uncovers chemical bonds; infrared spectroscopy detects heat; X-ray spectroscopy penetrates matter. Each wavelength of light tells a different story about the particles and forces at play.
Spectroscopy transformed our understanding of The universe, from the forge where heavy elements form to the composition of galaxies billions of light-years away.