Callisto

! colspan="2" style="background: #a0c0ff; text-align:center;" | Orbital characteristics ! colspan="2" style="background: #c0a5a0; text-align:center;" | Physical characteristics ! colspan="2" style="background: #d0a00c; text-align:center;" | Other
 * + Callisto
 * Orbital period || 26.6863 Terran days 24.70001 Callistoan days
 * Orbital axis Apojovine Perijovine || 5,647,895 km 5,689,319 km 5,606,472 km
 * Orbital axis Apojovine Perijovine || 5,647,895 km 5,689,319 km 5,606,472 km
 * Orbital axis Apojovine Perijovine || 5,647,895 km 5,689,319 km 5,606,472 km
 * Rotation period || 25.93 hours
 * Mean diameter || 16,872 km
 * Surface area Water Land || 894,300,000 km² 195,800,000 km² (22%) 698,500,000 km² (78%)
 * Temperature Min. Main Max. || 139 K 241 K 309 K
 * Atmospheric pressure (at MSL) || 1101 mbar
 * Surface area Water Land || 894,300,000 km² 195,800,000 km² (22%) 698,500,000 km² (78%)
 * Temperature Min. Main Max. || 139 K 241 K 309 K
 * Atmospheric pressure (at MSL) || 1101 mbar
 * Atmospheric pressure (at MSL) || 1101 mbar
 * Atmospheric pressure (at MSL) || 1101 mbar
 * Inhabitants Density || 0 (as of 2005) 0
 * Countries || none recognized (according to UN)
 * }
 * Countries || none recognized (according to UN)
 * }

Callisto is the fourth major planet of Jupiter. It is designated also Sol B IV.

History
Callisto was formed around 9 billion years ago. Then, it was even colder planet than now. But later growing of Jupiter made also Callisto become warmer. Unicellular organisms have been calculated to have reached the planet some 2 Gyr ago, and the evolution of life has been ongoing even since.

In 1854 AD Charles Darwin theorisized the existence of life on Callisto. In March 2nd, 2006 AD, Japanese astronauts landed on the planet. Several organisations have planned on colonization, while goverments of countries are not interested on this cold environment.