Neptune
Neptune is the eighth and farthest known Solar planet from the Sun. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times the mass of Earth, slightly more massive than its near-twin Uranus.
Information
Distance from Sun: 4.495 billion km
Orbital period: 165 years
Surface area: 7.618 billion km²
Radius: 24,622 km
Mass: 1.024 × 10^26 kg (17.15 M⊕)
Moons: Triton, Nereid, Proteus, Hippocamp, Thalassa, Despina, MORE
Discoverers: Urbain Le Verrier, Johann Gottfried Galle, John Couch Adams
Average temperature
-373 degrees F.
The average temperature on Neptune is a brutally cold -373 degrees F. Triton, Neptune's largest satellite, has the coldest temperature measured in our solar system at -391 degrees F. That is only 68 degrees Fahrenheit warmer than absolute zero, a temperature in which all molecular motion stops.
Zodiac sign
Neptune is the planet of inspiration. The higher octave of Venus, Neptune brings beauty to a higher, more spiritual level. It also holds sway over dreams, the subconscious, illusions, fantasies and all things magical and enchanting. Neptune intensifies intuition and teaches us to be deeply compassionate.
Orbital velocity
Orbital parameters
Volume
Density, mass, and volume
The rock, ices, and gas that make up the icy giant fill a volume of 15 trillion cubic miles (62 trillion cubic kilometers), almost 58 times the volume of Earth. The density of Neptune is 1.638 grams per cubic centimeter.
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