The device used to view distant objects is called a telescope. Telescopes come in various designs, including refractors, which use lenses, and reflectors, which use mirrors, to magnify the light from distant celestial bodies. They enable astronomers and enthusiasts alike to observe objects like stars, planets, and galaxies that are far beyond human vision. The invention of the telescope in the early 17th century revolutionized astronomy, leading to significant discoveries about our universe. It remains an essential tool for scientific study and exploration of space today.