
Determine the topic of the question-answer pair.
Question: "who discovered the 2 moons of mars,Phobos and Deimos?";  Answer: "Both satellites were discovered in 1877 by Asaph Hall and are named after the characters Phobos (panic/fear) and Deimos (terror/dread) who, in Greek mythology , accompanied their father Ares , god of war, into battle."? Topic: 