Neptune has the longest orbital period of any planet within the solar system. The eighth and most distant planet from the sun, it takes Neptune approximately 165 years to complete a single orbit.Know More
It has an elliptical orbit with an average distance from the Sun of 2.8 billion miles, approximately 30 times more distant than the Earth. This distance makes Neptune invisible to the naked eye from the surface of Earth.
As of 2014, Neptune has completed only one orbit since its existence was first mathematically inferred by French astronomer Alexis Bouvard in 1846. German astronomer Johann Galle subsequently used Bouvard's calculations to spot Neptune with a telescope on September 23, 1846.Learn more about Planets
The eight described planets all orbit the Sun at different distances; Mercury is the closest planet to the sun, followed by Venus, then Earth, Mars, Jupiter, Saturn, Uranus and Neptune. The distances of the planets are normally measured in kilometers, because scientists use metric measurements. However, scientists also use a unit called an “astronomical unit,” which is equal to the distance between Earth and the sun.Full Answer >
Mercury, which is the closest planet to the Sun, is 36 million miles from the sun, and Neptune, the eighth planet from the Sun, is approximately 2,790,000,000 miles away. The rest of the planets fall in between that range.Full Answer >
Neptune, the eighth planet from the sun, cannot support life according to NASA. Being so far from the sun makes Neptune a very cold planet, with temperatures reaching as low as -361.Full Answer >
One year on Neptune is equal to around 165 Earth years or 60,190 Earth days, which is the amount of time it takes the planet to complete its orbit around the sun. Days on Neptune last about 16 hours, which is 8 hours less than Earth. This is the amount of time that it takes for Neptune to make a complete rotation on its axis.Full Answer >