[/caption] The following Neptune fact sheet is based on NASA’s excellent planetary fact sheets. Neptune is the 8th planet from the Sun, and it requires a telescope to be able to see it. Mass: 102.43 x 1024 kg Volume: 6,254 x 1010 km3 Average radius: 24,622 km Average diameter: 49,244 km Mean density: 1.638 g/cm3 … Continue reading "Neptune Fact Sheet"