"Are the light levels on Mars sufficient to make it practical to build greenhouses for growing food and oxygenating plants?"
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Question
What do we think is necessary for life?
Versions of this question have been addressed in a number of previous answers -- please search this website for "habitability". No one knows exactly what is needed for life, but the minimum conditions seem to involve liquid water, the biogenic elements, and energy sources. One important objective of astrobiology research is to be able to provide answers to questions about habitability and the origin of life.
David Morrison
NAI Senior Scientist
December 9, 2003
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