Sternen is a term that translates to "stars" in German. Stars are luminous celestial bodies made primarily of hydrogen and helium, undergoing nuclear fusion to produce light and heat. They are found in vast numbers throughout the universe, forming galaxies and contributing to the cosmic landscape. In astronomy, stars are classified based on their size, temperature, and brightness. The closest star to Earth is the Sun, which is essential for life on our planet. Other well-known stars include Sirius, the brightest star in the night sky, and Betelgeuse, a red supergiant in the constellation Orion.