useless trivia: What Word Means: An Axon?

Questions

What is the only sign in the zodiac which doesn't represent a living thing?

Which month has a diamond as a birthstone?

A heavenly body moving under the attraction of the Sun and consisting of a nucleus and a tail is a(n) _______.?

Does Uranus have an aurora?

From 1979 until 2000 the most distant planet from the earth was ________.?