The Hubble Space Telescope, launched in 1990, revolutionized astronomy with detailed images and contributed to understanding the universe's large-scale structure and stellar evolution. The James Webb Space Telescope (JWST), launched in 2021, is the largest segmented mirror telescope in space at 6.5 meters across and observes in infrared, designed to see farther into the universe. The Cosmic Background Explorer (COBE), launched in 1989, mapped infrared and microwave background radiation, providing crucial clues about the universe's earliest history.