Size comparison: Jupiter vs Saturn

Size comparison between the planets Jupiter and Saturn. It is interesting to notice the similar shape of these two giant planets. These two celestial bodies have the same duration of rotation. The surface temperature is very cold there. Saturn's gravity is equivalent to that of Earth, while Jupiter's is 2.5 times greater. Saturn is twice as far from the Sun as Jupiter. Their respective number of natural satellites is similar. The composition of their atmosphere is also quite close.

What differentiates them the most is of course the presence of the rings around Saturn. These rings form a disc with a diameter of 360,000 kilometers, they are composed of frozen water, their origins are uncertain, they can result from a moon which would have deteriorated, or from the very formation of the planet. The latest studies assume that the rings are only 100 million years old. If they were as old as the planet, their color would be darker.

As well as the giant red spot on the surface of Jupiter. This task is a 15,000 km long and 12,000 km wide anticyclone which would present a composition of sulfur and phosphorus gases.

Object	Jupiter	Saturn
Type	Gaseous planet	Gaseous planet
Age	4.5 billion years	4.5 billion years
Diameter	139,820 km	116,460 km
Mean radius	69,911 km	58,232 km
Mass	1.89 × 1027 kg	5.68 × 1026 kg
Orbital period	12 years	29 years
Rotation duration	10 hours	10 hours
Surface temperature (average)	112 K -161 °C -258 °F	84 K -189 °C -308 °F
Surface gravity	24.79 m/s²	10.44 m/s²
Mean density	1.36 g/cm3	0.68 g/cm3
Orbital distance	760 million km	1,427 million km
Circumference	439,264 km	378,675 km
Surface area	6.14 × 1010 km2	42.7 × 109 km2
Volume	1.43 × 1015 km3	8.27 × 1014 km3
Escape velocity	59.5 km/s	35.5 km/s
Average orbital speed	13.07 km/s	9.68 km/s
Aphelion	816 million km	1,514 million km
Perihelion	740 million km	1,352 million km
Semi major axis	778 million km	1,433 million km
Inclination	1.3°	2.48°
Satellites	79 natural satellites 0 quasi-satellite 0 artificial satellite	82 natural satellites 0 quasi-satellite 0 artificial satellite
Surface pressure	70 kPa	140 kPa
Atmosphere composition	89% hydrogen, 10% helium, 0.3% methane, 0.026% ammonia	96.3% hydrogen, 3.25% helium, 0.45% methane, 0.0125% ammonia, 0.0110% hydrogen deuteride
Distance from the Milky Way center	27,200 light years	27,200 light years

Note: if one of the objects is not visible, it just means that it is too tiny to be displayed compared to the other one.