Misc: The process in which a solid changes directly to a gas is?

Questions

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

Astrology : Which month has a diamond as a birthstone?

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

Astronomy : Does Uranus have an aurora?

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