Neptune
Neptune is the eighth planet from the Sun, making it the most distant in the solar system.
It is not visible to the naked eye and was first observed in 1846. Its position was determined using mathematical predictions. It was named after the Roman god of the sea.
This gas giant may have formed much closer to the Sun in the early solar system history before migrating out to its current position.
Neptune Facts
- Equatorial Diameter: 49,528 km
- Polar Diameter: 48,682 km
- Mass: 1.02 × 10^26 kg (17 Earths)
- Moons: 14 (Triton)
- Rings: 5
- Orbit Distance: 4,498,396,441 km (30.10 AU)
- Orbit Period: 60,190 days (164.8 years)
- Surface Temperature: -201°C;
- Discovery Date: September 23rd 1846
- Discovered By: Urbain Le Verrier & Johann Galle