The instrument commonly used to look at stars and celestial objects is called a telescope. Telescopes have significantly enhanced our understanding of the universe. They come in various types, including refracting telescopes, which use lenses to gather light, and reflecting telescopes, which employ mirrors. By magnifying distant objects and capturing light outside the visible spectrum, telescopes reveal details about stars, planets, galaxies, and other celestial phenomena that would otherwise be invisible to the naked eye. Famous telescopes, such as the Hubble Space Telescope, have allowed astronomers to make groundbreaking discoveries, deepening our knowledge of the cosmos.