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Lauren Walrath

on 9 February 2016

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Transcript of Neptune

Solar System
Planet Measurements
The mass of Neptune is 1.02×10^26 kg.
If you wrote it out, it would be 102,000,000,000,000,000,000,000,000 kg.
The mean density is 1.64 g/cm³
The gravity is 11.15 m/s²
The volume is 6.254×10^13 km^3
The equatorial circumference is 96,685.4 mi
If you weighed 100 lbs on Earth, you would weigh 119 lbs on Neptune.

Composition and Atmosphere
The core is believed to be composed of rock and ice and is the size of Earth. The atmosphere is 80% hydrogen and 20% helium with traces of methane and ammonia.
Period 2

Sophia Sahota, Lauren Walrath, and Maddie Swenson
Surface Conditions
Journey to Neptune
The Temperature Can dip down to -360 degrees Fahrenheit, but the average is around -328 degrees Fahrenheit. The temperature is about 10 degrees warmer at the south pole because of the sun.

Neptune has very powerful wind storms from the significant difference in heat from the core of the planet to the surface. The temperature in the core is around 7000 degrees Celsius , which is comparable to the sun.

The large dark spot is an oval shaped anticyclone caused by the difference in temperature between the cloud surface and the core.
In 1989, a Great Dark Spot was discovered and had winds that reached up to 1,500 miles per hour. This spot disappeared in 1994 and a new spot had appeared.
Neptune is the 8th planet from the sun
Distance from the sun: 4.498 billion km and 30.1 AU
Revolves around the sun every 164.79 Earth years
Takes about 16 Earth hours to rotate
Axial tilt: 28.32° (to orbit)
Direction: Counterclockwise (ccw)

Neptune has fourteen moons. A few are Triton, Despina, Galatea, Larissa, and Neso. The moons were named in accordance with the 'water theme' of Neptune, all being named after different things, legends, and objects you'd find in the sea. Triton is the biggest moon and also the coldest. It's surface reaches temperatures of -400 degrees Fahrenheit. It's smallest moon (not officially named yet) happens to be it's newest, known as S/2004 N 1, measures only 12 miles across.
Triton, Neptune's largest moon.
Another one of Neptune's moons, Larissa.
Neptune has five rings. They are named Galle, Le Verrier, Lassell, Arago, and Adams, after famous astronomers who had made noticeable discoveries about Neptune. The Lassell ring is the biggest, and the Adams ring is the smallest. Each ring is made up of multiple smaller rings. The rings are composed of 20%-70% dust and small rocks.
Both pictures show Neptune with three of it's rings visible.
A picture of Neptune.****
Le Verrier, one of the astronomers who helped discover Neptune.
Voyager 2 visited Neptune on August 25, 1989. It is the only satellite that has visited Neptune. Voyager 2 discovered the Great Dark spot and Triton's (moon) geysers.

*As of right now, there are no known plans for another spacecraft to go to Neptune.*
Neptune is the eighth planet from the sun in the solar system and the fourth largest.
It is named after the Roman God of the Seas, also known as Poseidon in Greek. It was named Neptune because of it's blueish tone. It was discovered in 1613 by Galileo, who thought it was a star close to Jupiter. He noticed that it moved slightly along with Jupiter, but didn't think anything of it. Almost two centuries later, in 1846, it was observed again by Galle and d'Arrest. The two won a legal battle against Adams and Le Verrier to name it.

Neptune's symbol, also associated with the god Neptune.
Orbit and Rotation
One rotation on Neptune would take about 18 hours. One revolution would take about 60,190 Earth days, or 164.79 years. The closest Neptune gets to the Sun is 2,771,087,000 miles, or 4,459,630,000 kilometers. The farthest it gets from the Sun is 2,819,080,000 miles, or 4,536,870,000 kilometers.
Major gases: hydrogen and helium
Minor gases:
methane, ammonia, and hydrogen deutoride
Planet Appearance
Similar to Uranus, Neptune has a deep blue color from the methane in its atmosphere. Neptune also has rings which are made of ice particles coated with silicates or carbon-based materials, giving them a reddish look. Neptune sometimes shows a dark spot known as “the great dark spot.” The spot is 8000 miles long, and is a huge area with big storms that represents a hole in Neptune’s methane cloud.
Neptune is classified as an ice giant because of the large amounts of water and ice found in the hydrogen and helium atmosphere. Neptune's core is surrounded by highly compressed water.
*Human Travel*
If a human were to travel to Neptune, it would probably not go very well. It would take 12 years to get there if the ship was going at the speed of the Voyager 2. During that time, we would run out of food, water, oxygen, or go crazy on the ship.
In order for the planet to be habitable, Neptune would need to be smaller and in the habitable section of solar system (first four planets). Liquid water would need to be available as well.
Neptune's place in the solar system
Close up of Neptune
and it's storms
Composition of Neptune
Neptune's Composition
Voyager 2
Full transcript