1. Neptune
By: Madison and Breanna

2. History The planet’s name is Neptune.
Neptune was predicted by mathematical calculations and first observed on Sept 23,1846 by Johann Galle, Urbain Le Verrier, and John Couch Adams. On August 25,1989,the Voyager 2 flew past Neptune.
Neptune is named after the Roman god of the sea.

3. Discovery Neptune was discovered on September 23, 1846.
Johann Galle discovered Neptune by mathematical calculations of Urbain le Verrier.

4. Planet Structure
On the inside of Neptune, it is believed that clouds with ammonia and hydrogen would be seen if you visited the inside of Neptune.
Neptune’s atmosphere is composed primarily of hydrogen and helium, along with traces of hydrocarbons and possibly nitrogen, contains a higher proportion of “ices” such as water ammonia and methane. Neptune’s surface is primarily composed of ice and rock. Methane surrounding the planet gives it the blue hue.

5. Atmosphere
Neptune’s atmosphere is composed primarily of hydrogen and helium.
Neptune has methane in its atmosphere (blue green methane)
Neptune atmosphere consists of 74% hydrogen, 25% helium and about 1% methane

6. Motion 164 Earth years 60,152 earth days
The length of a day, or sidereal period, on Neptune is hours 6 min. 13 seconds ( days)

7. Missions Voyager August, 1989
Voyager 2 observed bright cirrus-like cloud cover in the region around The Great Dark Spot. The rapid changes in the clouds over 18 hours prove that Neptune’s weather is perhaps as dynamic as Earth’s. Neptune’s dark spot is no longer visible. Could this storm finally have ended?

8. Data Diameter- 49,528 km Average distance from the Sun- 4.5 billion km
Mass- 10,240 x 10 kg
Surface Gravity (Earth = 1)- 1.12
Average Temperature degrees Celsius
Number of observed moons-8*

9. Interesting facts Did you know?
Neptune was named after the god of the sea, probably because of its blue color.
Neptune gives off more heat then it receives from the sun. this means it probably has its own heat source.

10. Bibliography
STC/MS Earth In Space Pg.243
STC/MS Earth In Space Pg.238