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A small team of researchers from California Institute of Technology, NASA's Jet Propulsion Laboratory and Santiago High School has developed an updated version of an old equation to calculate the likely existence of extraterrestrial civilizations. The team has uploaded their paper to the arXiv preprint server.

Over the span of human history, many have wondered if life exists on other planets—intelligent or otherwise. As have been applied to the question, many space scientists have become convinced that the likelihood of developing seems more probable than not given all that has been learned. As other exoplanet systems have been found, many circling stars very similar to our sun, it has become difficult to find anything unique about our own planet to justify a belief that Earth alone ever produced life. In this new effort, the researchers have expanded on research done by Frank Drake back in 1961. He and his colleagues developed an equation (now known as the Drake equation) to calculate the odds of the existence of extraterrestrial civilizations—given all that was known about space and back then. The researchers factored in such variables as the number of believed exoplanets and and how many of them were likely to be capable of supporting life.

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