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
The Guardian of the Solar System The Guardian of the Solar System The Guardian of the Solar System is a Big Finish Productions audiobook based on the long-running British science fiction television series "Doctor Who". The Companion Chronicles "talking books" are each narrated by one of the Doctor's companions and feature a second, guest-star voice along with music and sound effects. The First Doctor, Steven and Sara Kingdom find themselves inside a giant clock, the great secret of The Guardians of the Solar System. "Doctor Who Magazine" reviewer Matt Michael said that the audio was "excellent", describing it has having a "dark, haunting atmosphere", and praising