The instrument used to see distant stars is the telescope. Telescopes gather and magnify light from celestial objects, allowing astronomers to observe stars, planets, and galaxies that are far beyond the naked eye's reach. There are various types of telescopes, including optical, radio, and space telescopes, each designed for specific wavelengths of light. The invention of the telescope in the early 17th century revolutionized our understanding of the universe, enabling significant discoveries such as the moons of Jupiter and the nature of distant galaxies. Telescopes remain essential tools in modern astronomy for exploring the cosmos.