Neptune

= Neptune:   =

1.) Neptune was the name that ancient Romans gave to the Greek god of the sea and earthquakes, Poseidon. 2) Neptune has a mass of **1.0243×1026 kilograms**, or about 17.147 times that of Earth. 3. Neptune has 13 known moons. The first four moons of Neptune, Naiad, Thalassa, Despina, and Galatea, are so close to Neptune that they orbit within its ring system. 4.
 * The diameter at Neptune's equator is** **49,528 ± 30 km** (30,775 miles) and **the diameter at** **Neptune's** **poles is 48,642 ± 60 km** (30,250 miles). Neptune is about 3.8 times the diameter of Earth.

5. The surface gravity of Neptune is 1.14 times the gravity on Earth. In other words, if you could actually walk on Neptune, you would feel only a little heavier than if you were walking on Earth.

Best guess for Neptune Gravity is **11.15 m/s².**


6.One orbit for Neptune takes nearly 165 Earth years (164.79 years). This is approximately **60,190 Earth days.** But a day (complete rotation) for Neptune is much shorter than Earth's, about 16 Earth hours. So there are about **89,666 "Neptune days"** in a "Neptune year".

7.The tilt of Neptune’s axis is 28.32 degrees. Compare that to the Earth’s tilt of 23.5 degrees.

8. 4,503,443,661 km,2.8 billion miles, 30.1 AU from the sun.

9.Neptune’s temperature can be as low as 55 Kelvin (-218 degrees Celsius). The average temperature of Neptune is about 73 Kelvin (-200 Celsius).