Astronomy 1 Lab Questions

Please include the questions and answers when you submit your assignment, here is the link for the questions below: http://www.abc.net.au/catalyst/stories/4180587.htm

Why do astronomers think that there may be other advanced civilizations?
What technologies are astronomers using to look for life on other planets? Why?
What are the challenges of looking for Dyson spheres?
Astronomers have theorized that there could be three types of civilizations. What are they? How would they be recognized? Which one has been ruled out so far?
Do you think an advanced civilization may exist in the universe? Why or why not?

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Astronomy
Why do astronomers think that there may be other advanced civilizations?
Astronomers think that there could be other advanced civilizations because of several reasons which include;
The galaxy surrounding the earth is more than ten billion years old while the planet we are living in is only four and a half billion years.

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