Scientists believe that to be the case with the moon orbiting Neptune since it is not going in the expected direction.
Neptune is an outer planet. It is the outermost planet in the solar system.
If by that you mean, weather its an outer or inner planet then Saturn is an outer planet...the 6th planet in our solar system.
Neptune is the outermost large planet in our solar system. However, the outermost known planet in our system, when including all classifications of planets, is Sedna, a dwarf planet.
Jupiter is an outer planet. It is one of the gas giants in our solar system and is located beyond the asteroid belt, closer to the outer reaches of the solar system.
Neptune
Chiron is a minor planet in the outer Solar System
Makemake is an asteroid/Kuiper belt object in the outer solar system.
The inner solar system is comprised of (in increasing distance from the Sun) Mercury, Venus, Earth, and Mars. The outer solar system is comprised of (same ordering) Jupiter, Saturn, Neptune, and Uranus.Pluto was downgraded to dwarf planet status in 2006, and is no longer considered a planet.
The element named after the coldest planet in the solar system is "Neptunium." It is named after the planet Neptune, which is known for its icy temperatures in the outer reaches of our solar system.
The gas giant Jupiter is the largest in the solar system, followed by Saturn, Uranus and Neptune.
Earth is the third planet. It is the inner part of solar system.
Saturn is the most beautiful planet on the outer loook