The Swift-Tuttle comet is a large comet that orbits the Sun approximately every 133 years. It was discovered in 1862 by two astronomers, Lewis Swift and Hermann Goldschmidt. This comet is notable for being the parent of the Perseid meteor shower, which occurs every August when Earth passes through the debris left behind by the comet. The Swift-Tuttle comet is about 26 kilometers wide, making it one of the largest comets known. Its orbit brings it close to Earth, and scientists closely monitor it to ensure it poses no threat. The next time it will be visible from Earth is expected to be in 2126.