Are earth signals strong enough to be detected?
What sort of spectrum is currently being emitted by earth? Is that signal visible say 10 or 50 light years away? If SETI were on a planet say 10-50 light years from here and running this project there, would it be able to detect earth’s signal (assuming it was looking in our direction)? Earth is polluting space with radio and television signals that might be detected by nearby advanced civilizations, but it would be difficult for such a civilization to discover these signals if they only have Earth’s current level of technology (eg: if they have an Arecibo like telescope and http://setiathome.berkeley.edu/ like search). Early TV shows like I Love Lucy and Ed Sullivan left the earth about 40 years ago, so have gone out 40 light years, reaching several thousand nearby stars. But these signals are relatively weak and http://setiathome.berkeley.edu/ is not likely to detect the equivalent of Earth type TV transmitters, even on the nearest stars. Earth’s strongest transmitters might be somew
