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 Engines of God at the other planets. Shortly thereafter, they detected two strange anomalies - giant clouds in space, traveling at a high rate of speed. Although the clouds were quite large - planet sized, at least - they were far too small to be natural objects. With insufficient mass, they should have been ripped apart by the star system's gravity. One of the mysterious clouds was on the far side of the solar system, but one would pass relatively close to the moon on which they were creating their fake Monuments. The mystery deepened when, suddenly, the nearby cloud began to change