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“It’s like cutting the ribbon on the Nina, the Pinta and the Santa Maria,” said Seth Shostak, an astronomer at the Seti Institute, in Mountain View, Calif.
"Anyone out there and broadcasting, for whatever wacky alien reason, would also have to be broadcasting right at Earth. But advanced civilizations, Dr. Shostak said, would be able to tell there was life on Earth because of the oxygen in our atmosphere.
“We’ve been broadcasting that for 2.5 billion years,” he said.