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  1. science.nasa.gov

    Planetary surface temperatures tend to get colder the farther a planet is from the Sun. Venus is the exception, as its proximity to the Sun, and its dense atmosphere make it our solar system's hottest planet. The mean temperatures of planets in our solar system are: ... Neptune: Minus 330°F (-200°C) Dwarf Planet Pluto: Minus 375°F (-225°C)
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  3. britannica.com

    Dec 14, 2024Neptune is almost four times the size of Earth but slightly smaller than Uranus, which makes it the smallest in diameter of the four giant, or Jovian, planets.It is more massive than Uranus, however, having a density roughly 25 percent higher. Like the other giant planets, Neptune consists primarily of hydrogen, helium, water, and other volatile compounds, along with rocky material, and it has ...
  4. planetary.org

    Neptune Facts. Average temperature: -201°C (-331°F) where atmospheric pressure equals sea level on Earth Average distance from Sun: 4,495 million kilometers (2,793 million miles), or 30 times farther from the Sun than Earth Diameter: 49,528 kilometers (30,775 miles), Neptune is 3.9 times wider than Earth Volume: 63 trillion km3 (15 trillion mi3), Earth could fit inside Neptune 63 times
  5. nssdc.gsfc.nasa.gov

    Neptune Observational Parameters Discoverer: Johann Gottfried Galle (based on predictions by John Couch Adams and Urbain Leverrier) Discovery Date: 23 September 1846 Distance from Earth Minimum (10 6 km) 4319.0 Maximum (10 6 km) 4711.0 Apparent diameter from Earth Maximum (seconds of arc) 2.4 Minimum (seconds of arc) 2.2 Mean values at opposition from Earth Distance from Earth (10 6 km) 4348. ...
  6. solarsystem.nasa.gov

    Most (80% or more) of the planet's mass is made up of a hot dense fluid of "icy" materials - water, methane, and ammonia - above a small, rocky core. Of the giant planets, Neptune is the densest. ... Neptune does not have a solid surface. Its atmosphere (made up mostly of hydrogen, helium, and methane) extends to great depths, gradually ...
  7. science.nasa.gov

    Neptune is the most distant planet in our solar system - the eighth major planet outward from the Sun. Dark, cold, and whipped by supersonic winds, the ice giant is more than 30 times as far from the Sun as Earth. Neptune does not have a solid surface. Its atmosphere is made mostly of hydrogen, helium, and methane, and extends to great depths, gradually merging into water and other melted ...
  8. reference.com

    Neptune is one of the coldest planets in the solar system, with an average temperature of -356 F at the edge of its atmosphere and -346 F at its surface. It is slightly warmer than Uranus despite being farther from the sun. This is because its interior is in motion more than that of Uranus, and some of this kinetic energy is converted into heat.
  9. planetfacts.org

    At the core, in contrast to the surface, temperatures reach 7000° C, which is as hot as the surface of the Sun. The temperature differences between the surface and the core results in powerful wind storms, which can hit as high as 2100 km/hr, making them the fastest in the system. The atmosphere of Neptune is composed mainly of helium and ...
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