You should ask it:

"Will mankind one day without the net expenditure of energy be able to restore the sun to its full youthfulness even after it had died of old age?"

Long-term, that would be the most useful possible way to spend the money.

(Source: http://www.multivax.com/last_question.html)

"You aren't going to like it..."

42

LSC: "Life has no meaning, you have the choice of giving it one, or let others give it for you."

BSOD