Michio Kaku answer's:
"Question One: You discuss evil aliens that might want to take over the Earth. But can't the aliens be friendly?Answer: Yes. In fact, I personally believe that alien civilizations will be benign, if only because they have had thousands of years in which to work out their differences. We have another program that addresses the possibility that they are friendly. But since we don't know their intentions, the point of this program was to address the possibility that they might be hostile.
Question Two: Why would they want to invade the earth? To take our resources?Answer: I personally believe that a friendly alien civilization will choose uninhabited planets in the search for resources. Any civilization advanced enough to reach the Earth would also be advanced enough to mine dead, uninhabited planets. Hence, more than likely they will leave us alone.
Question Five: When might we make contact?Answer: Perhaps sometime in this century. We now have satellites (the Kepler and Corot) specifically designed to find earth-like twins in space. And the SETI project has gotten a huge grant from billionare Paul Allen to expand its radio telescopes at Hat Creek outside San Francisco. So perhaps in this century we might actually receive messages from an alien civilization. But it's anyone's guess."
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