Titan is the largest moon of Saturn, has a dense atmosphere, and possesses clear evidence of bodies on liquid on or near the surface. Titan is often described as a planet-like moon. Its surface is likely marked with ice and rocky outcroppings, with liquid water with a high concentrate of ammonia. Titan probably hosts cryovolcanos, erupting with a mixture of water and ammonia. In 2004, the Cassini-Huygens space probe, launched jointly by NASA and the European Space Agency, visited the Saturn system and sent the Huygens probe to the surface of Titan. The next exploration of Titan, the Dragonfly mission, is scheduled to launch in 2027, arriving at Titan in 2034, and will be a robotic rotorcraft.