A telescope is the primary instrument used to view distant stars and planets. Telescopes come in various types, including refracting telescopes that use lenses and reflecting telescopes that utilize mirrors. They allow astronomers to gather more light and magnify distant celestial objects, making it possible to study their properties, movements, and compositions. The invention of the telescope revolutionized astronomy, enabling observers to discover previously unseen stars, moons, and even galaxies. Modern telescopes are often equipped with advanced technologies, including cameras and spectrographs, to provide detailed images and data that enhance our understanding of the universe.