Planet Neptune

Neptune, the 8th planet from the Sun and nearly a twin of planet Uranus, is the fourth-largest planet by diameter and the furthest planet discovered so far in our solar system. Planet Neptune gets its name after the Roman god of the sea. It is a gas giant.

8,317 Questions
Planet Neptune

How big is Planet Neptune?

Neptune is the fourth largest planet in the Solar System and 3.833 times larger than Earth.

  • Equatorial radius 24,764 km (15,388 miles)
  • Equatorial diameter of about 30,700 mi (49,400 km)
  • Polar radius 24,341 (15.125 miles)

Distance from the sun is 4.5 billion km it is -216C and the length of a year is 164 years 2888.54 days. Also the length of a day is 16 hours and 3 minutes long.

Planet Neptune

What are the high and low temperatures of Neptune?

Community Answer 1

This is a monstrously difficult question because Neptune is composed mostly of gas with a small core of rock.

It has been estimated that the temperature in the core is on the order of 7,000 °C, which is comparable to Earth's core or the surface of the Sun.

The mean atmospheric temperature on Neptune is as low as 218 °C (55.1 K) at the cloud tops and about -200 °C (72 K) at the pressure level equal to 1 Earth atmosphere.

Compare this to Uranus, which is a bit smaller but is closer to the sun. Uranus is a chilly -224 °C (49 K). Neptune is a long, long way from the sun, and very little energy gets there. But because it is as "warm" as it is, it is thought to have a core that is still generating heat.

That leaves us to make calculations and make an assessment as to why things are as we see them. We can figure out the amount of light Neptune gets, look at how much is reflected and how much is absorbed, and then look at its temperature. Some "extra heat" must be coming from somewhere, and the core is thought to be generating it. We really can't come up with a "surface temperature" per se for Neptune because of its structure. Wikipedia has more information, including a cutaway drawing of Neptune so you can see "into" this gas giant.


Community Answer 2

Average of -373 Fahrenheit/-225 Celsius


Community Answer 3

about -225 degrees Celsius and -375 degrees f

Planet Neptune
Planet Uranus
Similarities Between

What are three similarities between Uranus and Neptune?

1. They are similar in colour because of the composition of their atmospheres (methane).

2. Unexplored by humans because of the distance

3. They are very cold.

4. They are mostly made of gas.

5. They have very high pressure

Planet Neptune

Why can't we live on Neptune?

You would get pulled to Neptune's surface with such force that you would be squashed flat. It is also impossible to survive there because any vegetation dies due to the force of gravity out there. Also it too far away for us to reach so we couldn't get there even if it was able to be lived on.

Planet Neptune
Dwarf Planet Pluto
Planet Venus

How long would it take to get to Pluto from Earth?

On the Space Shuttle

The distance from Earth to Pluto is not constant, but averages to 3.57 billion miles. The Space Shuttle orbits at 17,500 miles per hour. Therefore 205,000 hours or 8,500 days or 23 years 105 days.

On the New Horizons probe

In January 2006, NASA launched the New Horizons probe on a mission to fly by Pluto. New Horizons is one of the fastest man-made objects ever launched, and is not scheduled to arrive at Pluto until July 2015 (it will not be entering orbit around Pluto. To do so it would have to slow down, significantly lengthening the travel time). So, as of now, it takes about 9.5 years to travel from the Earth to Pluto.

Planet Neptune

How many moons does Neptune have?

Neptune has fourteen known moons as of the year 2013, five of those fourteen having been discovered in 2002, 2003 and 2013.

Here's a list of all known moons, in order of increasing orbital radius from Neptune:

  • Naiad
  • Thalassa
  • Despina
  • Galatea
  • Larissa
  • Proteus
  • Triton
  • Nereid
  • Halimede
  • Sao
  • Laomedeia
  • Psamathe
  • Neso
  • S/2004 N1 (may soon be named Polyphemus)

Neptune has 14 moons that have been discovered so far. The largest is Triton and the smallest named moon is Psamathe.

Planet Neptune
English Spelling and Pronunciation

How do you pronounce Johann Gottfried Galle?

[yo-hauhn got-freed gah-leh]

Planetary Science
Planet Neptune
Planet Saturn

How far is Neptune from the Sun?

Neptune is the Eighth planet in the Solar System.

The distance from the Sun is:-

  • Aphelion (Furthest) 4,553,946,490 km (2,829,691,160 miles) ~30.44 AU
  • Perihelion (Nearest) 4,452,940,833 km (2,766,929,150 miles) ~29.766 AU
  • Semi major axis (Mean) 4,503,443,661 km (2,798,310,160 miles) ~30.1036 AU

Light takes over 4 hours to reach Neptune.

See related link for more information. 4,498,252,900 km

Planet Mars
Planet Mercury
Planet Neptune

How long does it take light to travel 4000 miles?

The speed of light is 186,000 miles per second, so divide 4000 by that figure. It's roughly .02 seconds, about 20 milliseconds.

Planet Mercury
Planet Neptune
Planet Jupiter

What is bigger than an asteroid but smaller than Mercury and farther from the sun than Neptune?

The Dwarf Planet Pluto.

Planet Neptune

Could life live on Neptune and why?

No, because Neptune is a gas planet and if you were to walk on it, you would actually sink into it.

Furthermore Neptune is -218 degrees Celsius so you wud like freeze to death. there food nor any means of growing food and it would be hard to reproduce on a gas planet.

Planet Neptune

What are the names of the moons of Neptune?

There are 13 known moons of the planet Neptune, and the largest by far is Triton. Neptune's moons are named for aquatic personages in Greek and Roman mythology, many of them after Nereids, in keeping with Neptune's position as god of the sea.

In order of increasing orbital distance from the planet, they are :

  1. Naiad
  2. Thalassa
  3. Despina
  4. Galatea
  5. Larisaa
  6. Proteus
  7. Triton
  8. Nereid
  9. Halimede
  10. Sao
  11. Laomedeia
  12. Psamathe
  13. Neso

* Voyager 2 is the only manmade spacecraft to have visited Neptune, in 1989. Triton was the last solid object Voyager saw before it left the solar system. The spacecraft sent back pictures of nitrogen "geysers" erupting on Triton's surface.

(for more on these moons, see the related link)

Planet Neptune

What are some facts about the planet Neptune?

Facts about the planet Neptune :

- It is the 4th largest planet in the solar system. It is the 3rd most massive because it is denser than the slightly larger Uranus.

- It is the farthest major planet from the Sun (Pluto and other dwarf planets are farther). It averages 4.5 billion kilometers from the Sun.

- It takes nearly 165 Earth years (164.79) to orbit the Sun

- Its outer clouds are as cold as -373 degrees Fahrenheit (55 K)

- It has a storm called "the great dark spot"

- It is most windy planet in the solar system, with measured wind speeds as high as 600 meters/second or about 1300 miles per hour.

- It has rings like Saturn, only fainter

- Neptune was named for the Roman God of the Sea, Neptune.

- Its astronomical symbol is a stylized symbol of the God Neptune's trident.

- First planet found by mathematical prediction rather than empirical observation.

- Neptune has been visited by only one spacecraft, the Voyager 2.

- The interior of Neptune is primarily composed of ices and rock.

- Neptune is never visible to the human eye due to its dimness.

- Traces of methane in the outermost regions in part account for the planet's blue appearance.

- Neptune's outer atmosphere is one of the coldest places in the solar system with temperature's approaching -218 degrees Celsius.

- Before being named Neptune, the planet was referred to as "the planet exterior to Uranus" and "Le Verrier's Planet".

- In 2009, Neptune was given a Hebrew name, Rahav, a biblical word denoting a mythical sea monster.

- It has only completed a single orbit of the Sun since its discovery in 1846.

(see also the related link below)

The internal structure of Neptune:

1. Upper atmosphere, top clouds

2. Atmosphere consisting of hydrogen, helium and methane gas

3. Mantle consisting of water, ammonia and methane ices

4. Core consisting of rock (silicates and nickel-iron)

Neptune has a shorter day than the Earth. One day measures about 16 Earth hours. Since it is the eighth major planet from the sun, it has the longest year. It takes 165 Earth years for Neptune to make one complete orbit around the Sun.

Scientists believe Neptune has a hot, rocky core about the size of Earth. It is covered with an ocean of water and other chemicals. The atmosphere is mainly hydrogen and helium. The high heat inside Neptune causes convection currents. Neptune probably gets as much heat from its central core as it does from the Sun. However, the average surface temperature is -355 degrees Fahrenheit. That is very cold.

Several dark spots have been seen on Neptune. The largest is about the size of Earth. It is called The Great Dark Spot. It may be a gigantic storm like the Great Red Spot on Jupiter. The Great Dark Spot was first seen by the Voyager 2 space probe in 1989. In the 1990s, the Hubble Space Telescope could not find it. Astronomers are not sure why it disappeared or whether it will reappear.

Long wispy clouds race around Neptune. They are blown by the fastest winds in the solar system. Near the Great Dark Spot winds blow up to 1,200 mph! One cloud zooms around the planet once every 16 hours. Scientists have nicknamed it Scooter because it moves so quickly.

Even though Neptune diameter is 30,200 miles, it is the smallest of the four gas planets. Neptune actually looks like a star through binoculars.

Neptune has 8 moons. The biggest ones are Triton and Nereid. Triton is even bigger than the planet Pluto! Unlike most moons, Triton orbits in the opposite direction of Neptune's spin.

We now know that Neptune may have faint rings. Neptune's rings were found in 1989.

In 2011, Neptune completed its first orbit around the Sun since astronomers discovered it in 1846

Neptune has the strongest winds in the solar system.

Neptune is the coldest planet in the solar system, but its moon Triton is even colder.

Planet Mars
Planet Neptune
The Moon

How much would you weigh at the center of the earth?

At the center of the earth, your weight would measure zero on a scale.

That is because the mass of the earth is evenly distributed all around you pulling you equally in all directions.

You would have the same mass as on the surface (assuming you didn't burn up from the hot hot hotness down there) but you would weigh 0. Weight is the measurement of gravity's effect on a mass.

Planetary Science
Planet Neptune
The Solar System

What planet has the coldest temperature?

Since Neptune, the 8th planet, is the furthest from the Sun, you'd expect it to be the coldest.

However, it isn't.

Neptune has a very hot core of molten ammonia and various gasses such as methane, which slightly heats the freezing planet.

In fact, the coldest planet is the 7th planet in our solar system, Uranus.

Neptune, the furthest, has an average temperature of -218°C (55K).

Uranus, the second furthest has an average temperature of -224°C (49K).

Pluto is -230°C (43K), however it is no longer classified as a planet.

Planet Neptune
Ancient Greek Art

Where does King Neptune get his name?

From the Greek God Neptune-King of the Sea

Planetary Science
Planet Neptune
Moons and Natural Satellites

What blue planet has 8 moons?


Planet Neptune
Planet Jupiter
Similarities Between

What are some similarities between Jupiter and neptune?

They both are gas giants.

Planet Neptune

What is the diameter of Neptune?

Neptune is spinning, and that makes the equator bulge a little bit, so the diameter at the equator is larger than its diameter at the poles. The diameter at Neptune's equator is 49,528 ± 30 km (30,775 miles) and the diameter atNeptune's poles is 48,642 ± 60 km (30,250 miles). Neptune is about 3.8 times the diameter of Earth.

Planet Diameter in kilometers

Mercury------------ 4,880

Venus -------------12,104

Earth --------------12,756

Mars ----------------6,794

Jupiter -----------142,984

Saturn -----------120,536

Uranus ------------51,118

Neptune -----------49,532

(Dwarf Planet Pluto --2,274) The diameter of Neptune at its equator is 30,599 miles, or 49,244 kilometers. Neptune is one of the gas giants in the Solar System. The diameter of Neptune is 49,532

AnswerNeptune's diameter is approximately 49,530 kilometers (30,789 miles). Here are all diameters of the planets. Pluto is no planet anymore. Mercury 4,880 km

Venus 12,104 km

Earth 12,756 km

Mars 6,794 km

Jupiter 142,984 km

Saturn 120,536 km

Uranus 51,118 km

Neptune 49,532 km Look for yourself. The diameter of Neptune is 30,599 miles. This is 49,244 kilometers. Neptune is a blue gas giant and the eighth planet from the Sun.

Planet Neptune

How big is Mercury compared to Neptune?

Neptune's diameter is 9.88 times that of Mercury's. So, you would need 9.88 mercurys to equal the diameter of Neptune.

WW1 Allied Forces
Planet Neptune
Dwarf Planet Pluto

Why can't people live on Neptune?

People cannot live on Neptune because it has no solid surface, only a molten core of liquid rock, water and ammonia. Also, it's four thousand mile thick atmosphere of hydrogen, helium and methane has temperature ranges from negative 360 degrees Fahrenheit to 900 degees Fahrenheit, winds of up to 1,200 miles per hour and chunks of molten debris whirling about. It's gravity is 114% that of Earth, and that is about the best that can be said for it, as that would add little to your weight in the second or two you would live unprotected.

See also: How long would a person live on Neptune?

Planet Neptune

How many hours in a day does Neptune have?

There are 16 hours.

Planet Neptune

Is there any present water in Neptune?

Yes, there is water inside Neptune. Actually most of Neptune's core is made of water and ice.

Planet Neptune

How far is Neptune from Earth?

The distance varies between 4.3 and 4.7 billion kilometers. Neptune is about 30 times farther from the Sun than Earth, and is the outermost of the 8 major planets.

When the Earth is on the same side of the sun as Neptune, the distance to Neptune is shorter than the distance when the Earth is on the opposite side of the sun from Neptune. The distance also changes because both planets revolve round the sun in ellipses, so their distance from the Sun varies. The distance of the Earth from the Sun varies from about 147.1 million kilometers to 152.1 million kilometers. The distance of Neptune from the Sun varies from 4.45 billion km to 4.55 billion km.

Therefore if the earth was on the opposite side of the sun from Neptune, at its maximum distance from the Sun, and Neptune was also at its maximum distance from the sun, the maximumdistance of Neptune from Earth would be 4702 million km (or 4.702 billion km).

If the earth was on the same side of the Sun as Neptune, at its maximum distance from the Sun (ie its nearest distance to Neptune) and Neptune was also at its minimum distance from the sun (ie, its nearest distance to earth), the minimum distance of Neptune from Earth would be 4298 million km (or 4.298 billion km). This is a variation of about 9%.

The average distance is 4564 million km or 4.564 billion kilometers (2.835 billion miles).

In other units, this distance would be 30.5 AU or 4.22 light hours or 0.000482 light years.

Planet Neptune

Does Neptune's moons have craters?

what of neptune's moons have craters


Copyright © 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.