Context: Neptune is the eighth and farthest known planet from the Sun in the Solar System. It is the fourth-largest planet by diameter and the third-largest by mass. Among the giant planets in the Solar System, Neptune is the most dense. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times the mass of Earth and slightly larger than Neptune.[c] Neptune orbits the Sun once every 164.8 years at an average distance of 30.1 astronomical units (4.50×109 km). Named after the Roman god of the sea, its astronomical symbol is ♆, a stylised version of the god Neptune's trident.

Question: What planet is Neptune's near-twin? 
Answer: Uranus

Question: How much more dense is Neptune compared to Earth?
Answer: 17 times

Question: What is Neptune named after?
Answer: Roman god of the sea

Question: What does the astronomical sign of Neptune represent?
Answer: god Neptune's trident

Question: How many Earth years does Neptune orbit the sun? 
Answer: 164.8 years

Question: What is the third largest planet by diameter
Answer: Unanswerable

Question: What is the eighth planet from the earth?
Answer: Unanswerable

Question: What is neptune the least dense of?
Answer: Unanswerable

Question: What is neptune 17 times smaller than?
Answer: Unanswerable

Question: What Greek god was neptune named for?
Answer: Unanswerable

Question: What planet is Neptune's opposite?
Answer: Unanswerable

Question:  How much lighter is Neptune compared to Earth?
Answer: Unanswerable

Question:  What does the astronomical sign of Uranus represent?
Answer: Unanswerable