Ever since human beings first turned our eyes skywards, to the planets, stars, and galaxies beyond our home world, the possibility of alien life filled our imaginations. When we approach the question scientifically, though, we still await the first conclusive confirmation of life beyond Earth. The complex, differentiated life forms we see here on Earth are the result of over four billion years of evolution, but cosmically, the ingredients for life are everywhere. We've began to discover organic molecules elsewhere in our Solar System, in interstellar space, and even around other stars. How long will it be before we have the first signs of life beyond our world? There are four ways we're presently searching for it, and which one will bear fruit first is anyone's guess.
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