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Our galaxy is 10 billion years old. The Earth is only 4.5 billion years old. We are a firefly flicker in the great astrobiology of the galaxy.

Geoffrey Marcy
Firefly, Earth, Galaxy
"Hunting for the Great Galactic Internet". Interview with Slate, www.slate.com. April 8, 2012.
Our galaxy is 10 billion years old. The Earth is only 4.5 billion years old. We are a firefly flicker in the great astrobiology of the galaxy.