8-1 Planets and the chemical building blocks of life are found throughout space
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8-2 Europa and Mars have the potential for life to have evolved
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8-3 Meteorites from Mars have been scrutinized for life-forms
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8-4 The Drake equation helps scientists estimate how many civilizations may inhabit our Galaxy
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8-5 Searches with space-based infrared telescopes and Earth-based radio telescopes for Earthlike planets and alien civilizations are under way
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