Want to know if life exists beyond the Earth? You may have to just wait for 20 more years! Life may exist on at least half-a-dozen other worlds - besides the Earth - and it may just take us another two decades to discover it, according to scientists. Scientists are searching for life beyond Earth using three different methods, Seth Shostak, senior astronomer with the California-based SETI Institute, said during a hearing before the House Science and Technology Committee. The first method involves the search for microbial extraterrestrials or their remains. Most efforts, so far, to find alien life have focused on Mars and potential life-bearing moons in the outer solar system, international online web media reported.