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Alien “ID Chart” to Aid Search for Extraterrestrial Life

The search for planets with extraterrestrial life has gotten a new tool: an “ID chart” that scientists will use to compare alien worlds with Earth as it has appeared over the eons. As technology improves to the point where Earthlike planets can be detected, astronomers have created an historical model of the Earth throughout its evolution for purposes of comparison. They identified six different epochs–stages in the evolution of carbon-based life–so that they can compare the spectra of those atmospheres with those of any promising new planets.

Link (via Fark.com)

Posted in News, Science, Space September 21st, 2006 by Chip
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