Next up is light. There are a few projects underway using light searches and proposing light communication on our part. A recent post in ScienceBlog describes a paper by UC Santa Barbara researcher Philip Lubin. He suggests in the journal REACH that directed energy may be useful in the search for extraterrestrials.
“In our paper, we propose a search strategy that will observe nearly 100 billion planets, allowing us to test our hypothesis that other similarly or more advanced civilizations with this same broadcast capability exist,” Lubin said. –ScienceBlog
Of course, it is entirely possible that even light would be an outmoded communication technique for extraterrestrials. It seems clear, though, that the only hope in this search is to constantly reevaluate our methods and utilize the latest advances in human technology to help re-define the search.