Cosmic Frontiers: SETI, Moon Bases, and the Road t...

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What are the professional occupations of Seth Shostak and Alexandra Barnett?

Astronomers who believe intelligent life exists elsewhere

According to astronomers in Passage 4A, what is the estimated age of the universe?

Approximately 12 billion years old

Why does the age of the universe lead astronomers to think intelligent life exists elsewhere?

12 billion years is too long for only one planet to develop life

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