Saturn It is difficult to say what is impossible, for the dream of yesterday is the hope of today and reality of tomorrow.- Robert Goddard. Saturn is the sixth planet from the Sun and is the second largest in the solar system with an equatorial diameter of 119,300 kilometers (74,130 miles).Much of what is known about the planet is due to the Voyager explorations in 1980-81.aturn It is difficult to say what is impossible, for the dream of yesterday is the hope of today and reality of tomorrow.- Robert Goddard. Saturn is the sixth planet from the Sun and is the second largest in the solar system with an equatorial diameter of 119,300 kilometers (74,130 miles).