Discovery and exploration of the Solar System Domenico Cassini later discovered four more moons of Saturn and the Cassini division in Saturn's rings. Edmond Halley realised in 1705 that repeated sightings of a comet were recording the same object, returning regularly once every 75–76 years. This was the first evidence that anything other than the planets orbited the Sun. Around this time (1704), the term "Solar System" first appeared in English. In 1781, William Herschel was looking for binary stars in the constellation of Taurus when he observed what he thought was a new comet. Its orbit revealed that it was a new planet, Uranus, the first
Wonders of the Solar System Cox concludes by stating that Europa represents the "most fascinating and important alien world we know. A true wonder of the Solar system because it's our best hope of finding extraterrestrial life." An accompanying hardcover book was released on 30 September 2010: The region 1 DVD and Blu-ray discs were released on 7 September 2010. The region 2 DVD and Blu-ray discs of the series were released on 12 April 2010. The region 4 DVD and Blu-ray discs were released on 7 April 2011. Brian Cox from his Twitter account stated that there would be a second series, "Wonders of