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Drake, who turned 80 in May, is still at it, directing the Carl Sagan Center for the Study of Life in the Universe at the nonprofit SETI Institute in Mountain View, Calif. Instead of just borrowing time from other astronomical instruments, those in the field now have camiseta psv eindhoven purpose-built tools at their disposal, such as the fledgling Allen Telescope Array (ATA) in Hat Creek, Calif. But funding is scarce--the ATA growth stalled at 42 dishes of a planned 350--and astronomers have not yet gathered enough data to make firm pronouncements about intelligent life in the universe.
"Although we have 'been doing it' for 50 years, we have not been on a telescope very much of that time," says Jill Tarter, director of the Center for SETI Research at the SETI Institute. replicas de camisetas de futbol "What we can say is that every star system in the galaxy isn't populated camiseta sunderland afc by a technology that's broadcasting radio signals at this time."
Theoretical astrophysicist Alan P. Boss of the Carnegie Institution for Science agrees. "The lack of a SETI signal to date simply means that civilizations that feel like broadcasting to us are not so common that the limited SETI searches would have found one," Boss says. "There is still a lot of the galaxy that has not yet been searched." One of the most extensive campaigns to date, Project Phoenix, surveyed nearby stars across a wide range of frequencies using some of the world's largest radio telescopes. In nine years Phoenix sampled roughly 800 stars, less than one millionth of 1 percent of the Milky Way.