Gravitational Pull. A total of six storm systems have been spotted since scientists first set their sights on Neptune. Neptune’s Surface Gravity is Almost Earth-like: Neptune is … # 5. explore. 49,528 km. Each storm may last up to six years, though two-year lifespans were more likely, according to findings published March 25 in the Astronomical Journal. 164.79 Earth years. Neptune is denser and physically smaller than Uranus because its greater mass causes more gravitational compression of its atmosphere. Rotation Period. Voyager 2 identified two storms in 1989. Revolution Period. Neptune 13 Moons in total. Neptune is the eighth and farthest-known Solar planet from the Sun. Like Jupiterand Saturn, Neptune is a gas giant—a big ball of gas surrounding an Earth-size core of hot liquids rather than rocks or other solid matter. The coldest planet in our solar system. Five hours later, Voyager 2 passed about 40,000 kilometers (25,000 miles) from Neptune’s largest moon, Triton, the last solid … explore. As the windiest, furthest, and faintest planet in our solar system, Neptune is a fascinating world of superlatives. It takes Neptune 165 Earth years to orbit the sun. What Is the Weather Like on Other... Each of the planets in our solar system experiences its own unique weather. explore. Neptune has 6 Rings. 1 day on Neptune lasts for about 16 hours, compared to Earths 24 hours. Equatorial diameter. In fact, at 1.638 g/cm 3, Neptune is the densest gas giant in the Solar System. All About Neptune. In the summer of 1989, NASA’s Voyager 2 became the first spacecraft to observe the planet Neptune, its final planetary target. NASA's Curiosity Mars rover has started a road trip that will continue through the summer across roughly a mile (1.6 kilometers) of terrain. Neptune is the most distant of the solar system's eight planets. 1.2 times that of the Earth. Kids Fun Facts Corner # 1. 4.501 billion km. # 3. These spacecraft traveled to the outer planets! It is more massive than Uranus, however, having a density roughly 25 percent higher. Neptune 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. Only one probe from Earth has ever been sent to Neptune. # 4. Passing about 4,950 kilometers (3,000 miles) above Neptune’s north pole, Voyager 2 made its closest approach to any planet since leaving Earth 12 years ago. Neptune 101. # 2. Neptune has the strongest winds of any planet in the solar system. 16.11 hours. It is 17 times the mass of Earth, slightly more massive than its near-twin Uranus. Curiosity Mars Rover's Summer Road Trip Has Begun This image from NASA’s Juno spacecraft captures several storms in Jupiter’s southern hemisphere. 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