Neptune has an average diameter of 30,598 miles, which is approximately almost four times Earth's diameter. In terms of mass, Neptune weighs approximately 102 trillion trillion kilograms, making it 17 times heavier than ... More »

Neptune was the first planet to have its existence predicted by mathematical calculations before it was seen through a telescope. According to Space, wind speeds on Neptune can reach up to 1,500 miles per hour; the faste... More »

Neptune is the eighth planet from the sun and appears bright blue in color. It was discovered by German astronomer Johann Galle in 1846 and is named after the Roman god of the sea, Neptune. It is a sister planet to Uranu... More » Science Astronomy Planets indicates that Neptune's diameter of 15,299 miles is fourth longest among the planets. At 102 trillion trillion kilograms, Neptune has the third-highest mass of the eight planets in the solar system. However, i... More » Science Astronomy Planets

It took the Voyager 2 spacecraft a total of 12 years to get from Earth to Neptune. However, the exact amount of time required to travel to Neptune depends on the path and where the planets are in their orbits. More »

Although they are quite dissimilar in almost every way, the Earth and Neptune do share some similar qualities such as gravity, color and orbit. With a gravitational pull that is only 14-percent stronger than the Earth's,... More »

Neptune is the eighth planet from the sun, and it's about 2.8 billion miles away from the sun. This distance is roughly 30 times further away from the sun than Earth is, making Neptune a cold and dark planet. More »