Jupiter is believed to be the oldest planet in the Solar System.=10.5px Current models of Solar System formation suggest that Jupiter formed at or beyond the snow line: a distance from the early Sun where the temperature is sufficiently cold for volatiles such as water to condense into solids. The planet began as a solid core, which then accumulated its gaseous atmosphere. As a consequence, the planet must have formed before the solar nebula was fully dispersed. During its formation, Jupiter's mass gradually increased until it had 20 times the mass of the Earth (about half of which in silicates, ices and other heavy-element constituents). While the orbiting mass increased beyond 50 Earth masses, it created a gap in the solar nebula. Thereafter, the growing planet reached its final masses in 3–4 million years.According to the "grand tack hypothesis", Jupiter began to form at a distance of roughly 3.5 AU (520 million km; 330 million mi) from the Sun. As the young planet accreted mass, interaction with the gas disk orbiting the Sun and orbital resonances with Saturn caused it to migrate inward.=10.5px This upset the orbits of several super-Earths orbiting closer to the Sun, causing them to collide destructively. Saturn would later have begun to migrate inwards too, much faster than Jupiter, until the two planets became captured in a 3:2 mean motion resonance at approximately 1.5 AU (220 million km; 140 million mi) from the Sun. This changed the direction of migration, causing them to migrate away from the Sun and out of the inner system to their current locations. All of this happened over a period of 3–6 million years, with the final migration of Jupiter occurring over several hundred thousand years. Jupiter's departure from the inner solar system eventually allowed the inner planets—including Earth—to form from the rubble.
 Physical characteristicsMean radius69,911 km (43,441 mi)
10.973 of Earth'sEquatorial radius71,492 km (44,423 mi)
11.209 of Earth'sPolar radius66,854 km (41,541 mi)
10.517 of Earth'sFlattening0.06487Surface area6.1469×1010 km2 (2.3733×1010 sq mi)
120.4 of Earth'sVolume1.4313×1015 km3 (3.434×1014 cu mi)
1,321 of Earth'sMass1.8982×1027 kg (4.1848×1027 lb)

• 317.8 of Earth's
• 1/1047 of Sun

Source: Wikipedia