Mauna Kea Observatory - A Night in the Life of an Astronomer Time Lapse - YouTube

Observatories use laser beams primarily for a technique called adaptive optics.This method helps astronomers get clearer images of celestial objects by compensating for the distortion caused by Earth's atmosphere.The lasers excite atoms,causing them to glow and form 'artificial stars',which advanced telescopes can use to compensate their mirrors,creating sharper images.

Astronomers find most distant merging quasars yet - YouTube - Space.com - cosmology

Credit:NOIRLab/National Science Foundation/Aura A quasar is an extremely luminous Active Galactic Nucleus (AGN).It is also known as a Quasi-Stellar Object.The emission from an AGN is powered by a supermassive black hole.Quasars emit gigantic amounts of radiation,sometimes more than all radiation from one large galaxy.They are so bright,they can be seen in the far reaches in the universe.This pair of merging quasars date back to only 990 million years after the Big Bang. They were discovered by the combined efforts of the Gemini North Telescope and Subaru Telescope on Mt.Mauna Kea,Hawaii.*Cosmology is the study of the origin and structures of the universe.