Submillimeter astronomy is a branch of astronomy that studies celestial objects by observing the submillimeter wavelength range of electromagnetic radiation, typically between 0.1 and 1 millimeter. This range is crucial for understanding cold and dense regions of space, such as molecular clouds, star-forming regions, and the early universe. Instruments like the James Clerk Maxwell Telescope and the Atacama Large Millimeter/submillimeter Array are commonly used for these observations. The submillimeter wavelengths allow astronomers to detect and analyze various molecules, including carbon monoxide and water vapor, which are essential for understanding the formation of stars and galaxies. By studying these wavelengths, researchers can gain insights into the physical conditions and processes occurring in the universe, contributing to our knowledge of cosmic evolution.