Instead of solely using light in the visible spectrum, the new method also used spectroscopy in the infrared spectrum, which is not visible to the human eye.

Source: https://theaggie.org/2023/05/15/uc-davis-study-improves-measurements-of-galaxy-composition/

On basis of application, the process spectroscopy market across the globe is sectored into food & agriculture, polymer, pulp & paper, pharmaceuticals, water & wastewater, oil & gas, chemical, and metal & mining segments.

Source: https://forextv.com/top-news/global-process-spectroscopy-market-size-is-set-to-skyrocket-with-a-cagr-of-7-10-to-reach-around-33-15-billion-by-2030-medical-devices-analysis/

Only after using spectroscopy did they come to the conclusion that it was the aftermath of a black hole flying through a halo of gas surrounding the host galaxy.

Source: https://hothardware.com/news/hubble-spots-runaway-black-hole-lunging-through-space-with-huge-star-tail

Raman spectroscopy provides important insights into the chemical makeup of a sample by using light to excite molecular vibration.

Source: https://phys.org/news/2023-02-technology-raman-microscopy-clinic.html

Shan Kothari et al, Predicting leaf traits across functional groups using reflectance spectroscopy, DOI: 10.1111/nph.

Source: https://phys.org/news/2023-02-statistical-leaf-traits-functional-groups.html

To confirm the chitin identity, Matthews used different techniques such as circular dichroism and Fourier-transform infrared spectroscopy — a process to definitively identify compounds — to match the molecular fingerprint to commercial chitin from shrimp.

Source: https://northfortynews.com/category/business-education/chocolate-covered-cricket-chitin-a-good-stomach-bug-at-heart-of-csu-study-on-people-with-ibs/

Yuan Cao et al, Dual mid-infrared wavelength Faraday rotation spectroscopy NO sensor based on NdFeB ring magnet array, Sensors and Actuators B: ChemicalDOI: 10.1016/j.

Source: https://phys.org/news/2023-05-faraday-rotation-spectroscopy-sensor-enables.html