1. Neptune
By: Jason Smith

2. Symbol

3. Name
In Roman mythology, Neptune was the god of the sea.

4. Discovery
Who: Johann Gottfried and Henrich Louis d’Arrest When: 23 Sep 1946 How: based on calculations by Urbain Jean Joseph Le Verrier

5. Distance
Orbit from the Sun: # 8 Distance from the Sun: 4,504,000,000 km Distance from the Earth: 4,500,000,00 km

6. Planet Measurements
Mass: 102,410,000,000,000,000,000,000,000 kg Volume: 62, 525, 703, 987, 421 km3 Density: g/cm3 Neptune sinks, because its density is greater than that of water Gravity: m/s2

7. Orbit and Rotation
Revolution: 60,190 Earth Days (164.8 years) Rotation: 0.67 Earth Days (19.1 hours)

8. Atmosphere
74 % Hydrogen 25 % Helium 1 % Methane (at depth) Very thin atmosphere

9. Temperature
Average: -353 degrees Fahrenheit Much colder than Earth and Florida

10. Composition/Appearance
Type: Gas Giant – mostly composed of ice, hydrogen, and helium Internal Composition: Small, rocky core and icy mantle Neptune looks like a giant, blue-green sphere. The color comes from methane in Neptune’s atmosphere. If you are close enough, you can view the rings.

11. Weather
Winds whip clouds of frozen methane across the planet at speeds of 2,000 km/h (1,200 mph). Neptune is the windiest planet.

12. Rings
Most of the rings are faint arcs and were discovered in There are at least 9 rings. They are a faint, whitish color and are made of stars.

13. Moons
There are 13 moons (8 of which are named): Naiad – discovered 1989 Thalassa – discovered 1989 Despina – discovered 1989 Galatea – discovered 1989 Larissa – discovered 1989 Proteus – discovered 1989 – dotted with craters Triton – discovered 1846 – retrograde orbit Nereid – discovered 1949 – irregular shape

14. Water
There is no known evidence of water on Neptune.

15. What would happen to a human?
Since there is no surface, the only safe way would be in a secure aircraft in a flyby. However, it would take a long time to get to Neptune in the first place.

16. Something Special
#1. Due to Pluto’s strange orbit, it is sometimes closer to Earth, and, thus, the sun, than Neptune. #2. If the sun were the size of a front door, Neptune would be the size of a baseball. #3. Neptune was the first planet located through mathematical predictions, rather than observations in the sky.

17. Bibliography
"Astr 121, Winter '05, Chapter 13 Notes on Uranus and Neptune." Astr 121, Winter '05, Chapter 13 Notes on Uranus and Neptune. N.p., n.d. Web. 18 Dec "Distance Calculator - Distance between Cities - Driving Distance Calculator." Driving Distance Calculator. N.p., n.d. Web. 18 Dec "ENCHANTED LEARNING HOME PAGE." ENCHANTED LEARNING HOME PAGE. N.p., n.d. Web. 15 Dec "Neptune God of the Sea." Flickr. Yahoo!, n.d. Web. 18 Dec "Neptune Symbol By meatballhead Follow." Redbubble. N.p., n.d. Web. 18 Dec "Neptune, Words from Myths." - Word Information. N.p., n.d. Web. 18 Dec "Nine Planets." The Solar System Tour. N.p., n.d. Web. 15 Dec "Solar System Exploration: : Planets." Solar System Exploration: : Planets. N.p., n.d. Web. 17 Dec "Welcome to the PDS." Welcome to the Planetary Data System. N.p., n.d. Web. 18 Dec Wikipedia. Wikimedia Foundation, n.d. Web. 18 Dec