<P> Galileo Galilei was the first to discover physical details about the individual bodies of the Solar System . He discovered that the Moon was cratered, that the Sun was marked with sunspots, and that Jupiter had four satellites in orbit around it . Christiaan Huygens followed on from Galileo's discoveries by discovering Saturn's moon Titan and the shape of the rings of Saturn . Giovanni Domenico Cassini later discovered four more moons of Saturn and the Cassini division in Saturn's rings . </P> <P> 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 . </P> <P> 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 ever discovered . </P> <P> Giuseppe Piazzi discovered Ceres in 1801, a small world between Mars and Jupiter that initially was considered a new planet . However, subsequent discoveries of thousands of other small worlds in the same region led to their eventual reclassification as asteroids . </P>

Who discovered the shape and scale of the solar system