Ice giant in mass. In 1952, science fiction writer James Blish coined the term "gas giant" and it was used to refer to the large non-terrestrial planets of the Solar System. However, in the 1990s, the compositions of Uranus and Neptune were discovered to be significantly different from those of Jupiter and Saturn. They are primarily composed of elements heavier than hydrogen and helium, constituting a separate type of giant planet altogether. Because during their formation Uranus and Neptune incorporated their material as either ices or gas trapped in water ice, the term "ice giant" came into use. Modelling the formation of
The Guardian of the Solar System its "astonishing" imagery. 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