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One of the promising methods to search for life on extra-solar planets(exoplanets) is to detect life's signatures in their atmospheres. Spectra ofexoplanet atmospheres at the modest resolution needed to search for oxygen,carbon dioxide, water, and methane will demand large collecting areas and largediameters to capture and isolate the light from planets in the habitable zonesaround the stars. For telescopes using coronagraphs to isolate the light fromthe planet, each doubling of telescope diameter will increase the availablesample of stars by an order of magnitude, indicating a high scientific returnif the technical difficulties of constructing very large space telescopes canbe overcome. For telescopes detecting atmospheric signatures of transitingplanets, the sample size increases only linearly with diameter, and theavailable samples are probably too small to guarantee detection of life-bearingplanets. Using samples of nearby stars suitable for exoplanet searches, thispaper shows that the demands of searching for life with either technique willrequire large telescopes, with diameters of order 10m or larger in space.

Detecting Life-bearing Extra-solar Planets with Space Telescopes