1. There's a big possibility. Since there's millions of star in the universe. It just a matter of time. We have to be prefer in how to respond in such an event, that a ET visit us or we found one in the universe.
2. Yes, I think so. First, just to communicate find out more about them. No details info or military capability.
3. Just to help out. It's a start in finding ways to search for ET.
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.