Helly's Comet is a periodic comet that orbits the Sun approximately every 76 years. It was first discovered in 1835 by astronomer John Helly, and it is known for its bright tail and distinctive appearance when it approaches the inner solar system. The comet's orbit takes it from the outer regions of the solar system into the inner solar system, where it becomes visible from Earth. Its next expected return is in 2111, making it a fascinating object for astronomers and skywatchers alike.