You are....
AQUARIUS
Aquarius is obviously associated with water, the modern day elixir of life. Many ancient socities see Aquarius as God or Zeus pouring the water of life down from heaven.
You are one tall drink of water!(Excuse the puns, I just can't help it!)You are always the life of the party, and always thinking up fun stuff to do! Sometimes you're hyper, sometimes you're not. However, catch you in the wrong mood, and like water, you can easily become angry, rather unreasonably.
Which constellation are you?
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Check it out:
Tall - check
Hyper - check
Moody - check
And how much do I know about astronomy?
Professional
You know maybe too much. Are you sure you're from
this planet? If you are from planet Earth,
wow. Impressive. Good job.
How much do you know about astronomy?(REALLY HARD!)
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Well I guess I did learn something from those Astronomy classes :)