Sunday, July 13, 2014


Order from Sun: 8
Named For: Roman god of the sea
Diameter: 30,600 miles
Volume: 57x Earth
Gravity: 1.14x Earth
Distance from Sun: 2.8 billion miles
Orbital Period: 164 years
Orbital Inclination: 1.77 degrees
Orbital Eccentricity: .008
Length of Day: 16.11 hours
Temperature: -353F
Composition: Gasses, ices
Atmospheric Composition: hydrogen, helium, methane
Moons: 14
Rings: faint, partial
Notable Exploration: Voyager 2 (1989)

The only planet ever predicted by mathematical calculations, Neptune was discovered by Johann Gallee in 1846 and is invisible to the unaided eye thanks to its shining at an apparent magnitude of around +8. Uranus takes about 84 years to orbit the Sun and thus spends over 13 years in any given constellation of the zodiac.

Thanks to its immense distance, even in telescopes, the only way to tell Neptune apart from background stars is to observe it at high powers and look for the distinctive, clean-cut planetary disc.

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