Jovian planets definition of Jovian planets in the Free Online Encyclopedia.

Jovian planets, the planets Jupiter Amalthea (diameter: 117 mi/189 km), a small, elongated satellite discovered (1892) by Edward Barnard , probably results from a coating of sulfur particles ejected from Io.

Metis (diameter: 25 mi/40 km),

Adrastea (diameter: 12 mi/20 km), and

..... Click the link for more information. , Saturn Saturn, in astronomy, 6th planet from the sun.

Astronomical and Physical Characteristics of Saturn

Saturn's orbit lies between those of Jupiter and Uranus; its mean distance from the sun is c.886 million mi (1.
..... Click the link for more information. , Uranus Uranus (y

rā`nəs, y
..... Click the link for more information. , and Neptune Neptune, in astronomy, 8th planet from the sun at a mean distance of about 2.8 billion mi (4.5 billion km) with an orbit lying between those of Uranus and the dwarf planet Pluto; its period of revolution is about 165 years.
..... Click the link for more information. . They are all larger and more massive than the earth. Since they rotate faster, they are more flattened at the poles than are the terrestrial planets terrestrial planet, the earth or a planet that resembles the earth in its physical characteristics. The terrestrial planets in the solar system are the earth , Mercury , Venus , and Mars . These planets are approximately the same size, with the earth the largest.
..... Click the link for more information. . They are less dense than the earth, as they are composed of gaseous matter, predominantly hydrogen.