Flame — HabitableZone

Flame » in reply to Out of the tens of millions of species on Earth

Spectral absorption lines of O2 and O3...

...might be detectable much further away than that, and it's been produced by plankton for a billion years.

http://www.spacedaily.com/news/life-02zw.html

...not that this makes us any more or less meaningful.

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