Space telescopes refer to telescopes that are placed in outer space to observe distant celestial objects such as planets, stars, galaxies, and other astronomical phenomena. These telescopes are typically placed in orbit around the Earth or other celestial bodies to avoid interference from the Earth's atmosphere, allowing for clearer and more precise observations. Space telescopes have the advantage of being able to observe astronomical objects in a wider range of wavelengths, including ultraviolet, X-ray, and gamma-ray wavelengths, which are typically absorbed by the Earth's atmosphere. This allows astronomers to study objects and processes in space that would be otherwise invisible from Earth. Some of the most famous space telescopes include the Hubble Space Telescope, which has provided stunning images and invaluable data on the universe since its launch in 1990, and the Chandra X-ray Observatory, which has helped to study high-energy phenomena such as black holes and supernovae. Overall, space telescopes play a crucial role in advancing our understanding of the universe and uncovering new insights about the cosmos.