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Size Comparison: Jupiter vs Neptune



Comparison of size and physical characteristics between the gas giant planets Jupiter and Neptune.

We see here the immeasurable time required for Neptune to go around the sun. A human on Neptune would not reach a year if we took this planet as a reference. The temperatures are very low. The number of natural satellites for these two celestial bodies are quite high. The compositions of the respective atmospheres are quite similar. We see that Jupiter is much more massive than Neptune.

Color difference.

Yet their colors are different. Jupiter presents orangeish, reddish, brown colors, due to the presence of ammonia crystals on the surface. While Neptune is deep blue, methane largely absorbs light, especially red wavelengths resulting in blue. But in theory its color should rather be similar to that of Uranus, if it were only due to methane, ie aquamarine blue (very light sky blue). There are therefore other chemical elements unknown for the moment which cause Neptune's blue to tend towards dark blue.

Neptune
Neptune


Object Jupiter Neptune
TypeGaseous planetGaseous planet
Age4.5 billion years4.5 billion years
Diameter139,820 km49,244 km
Mean radius69,911 km24,622 km
Mass1.89 × 1027 kg1.02 × 1026 kg
Orbital period12 years164.8 years
Rotation duration10 hours16 hours
Surface temperature
(average)
112 K
-161 °C
-258 °F
55 K
-218 °C
-360 °F
Surface gravity24.79 m/s²11.15 m/s²
Mean density1.36 g/cm31.63 g/cm3
Orbital distance760 million km4.5 billion km
Circumference439,264 km154,704 km
Surface area6.14 × 1010 km27.6 × 109 km2
Volume1.43 × 1015 km362.5 × 1012 km3
Escape velocity59.5 km/s23.5 km/s
Average orbital speed13.07 km/s5.43 km/s
Aphelion816 million km4.54 billion km
Perihelion740 million km4.46 billion km
Semi major axis778 million km4.50 billion km
Inclination1.3°1.77°
Satellites 79 natural satellites
0 quasi-satellite
0 artificial satellite
14 natural satellites
1 quasi-satellite
0 artificial satellite
Surface pressure70 kPa1 Pa
Atmosphere composition 89% hydrogen,
10% helium,
0.3% methane,
0.026% ammonia
80% hydrogen,
19% helium,
1.5% methane,
0.019% hydrogen deuteride
Distance from the Milky Way center27,200 light years27,200 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.


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