1. Extraterrestrial life exists ? Yes. Discover it in future, how ? I dont'know. Benefits or danger ? Both of them.
2. It's already made.
3. Try to find other means to discover space, as space ships. To make it, we need help, better technology than our.
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.