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More than 30 times as far from the Sun as Earth, Neptune is the only planet in our solar system not visible to the naked eye and the first predicted by mathematics before its discovery. In 2011 Neptune completed its first 165-year orbit since its discovery in 1846. NASA's Voyager 2 is the only spacecraft to have visited Neptune up close. It ...


Neptune, the eighth and last planet from the sun, is one of the coldest. But despite its great distance, the planet undergoes seasons much like the Earth, creating warmer spots on the planet.


Neptune and the icy-asteroid-rich Kuiper Belt that lies beyond its orbit. Credit: NASA. Neptune takes 16 hours 6 minutes and 36 seconds (0.6713 days) to complete a single sidereal rotation, and ...


The average temperature on Neptune is about minus 200 degrees Celsius (minus 392 degrees Fahrenheit). Neptune, the farthest known planet of our solar system, is located about 30 times farther away from the sun than Earth is. Only about one thousandth of the sunlight received by our planet reaches Neptune.


Neptune is the eighth and farthest known planet from the Sun in the Solar System. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet. Neptune is 17 times the mass of Earth, slightly more massive than its near-twin Uranus. Neptune is denser and physically smaller than ...


NASA’s real-time science encyclopedia of deep space exploration. Our scientists and hardworking robots are exploring the wild frontiers of our solar system. NASA. NASA Science Solar System Exploration. Skip Navigation. Neptune Overview. In Depth. By the Numbers ... Long-term observations of Neptune have allowed scientists observe storm ...


The average temperature on Neptune is a brutally cold -373 degrees F. Triton, Neptune's largest satellite, has the coldest temperature measured in our solar system at -391 degrees F. That is only 68 degrees Fahrenheit warmer than absolute zero, a temperature in which all molecular action stops. QUICK FACTS (Data is from NASA Goddard)


All About Neptune. Explore Neptune! Click and drag to rotate the planet. ... Credit: NASA Visualization Technology Applications and Development (VTAD) What is Neptune like? Neptune is dark, cold, and very windy. It's the last of the planets in our solar system. It's more than 30 times as far from the sun as Earth is. Neptune is very similar to ...


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) 4305.9 Maximum (10 6 km) 4687.3 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) 4347 ...


The average temperature on Neptune is about -360℉. If that sounds familiar, it's because Uranus is about the same temperature. The reason why the two planets are the same temperature at such different distances from the Sun is still a mystery. Neptune has a thick atmosphere and is covered by constantly changing clouds that whip around the planet.