As expansive as the universe is, it is pretty hard to believe extraterrestrial life does not exist, but who really knows. Without projects like SETI, "ET" may never ever be discovered.
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.