In this issue, we look at life in space from several perspectives: how it began, where else it might be, and the physiological effects of space on humans and other organisms.
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Our video experiment last week explored responding to extremes, and this one looks at at how we search for life. What biomarkers can we use? This film, which touches on the Viking space probes to Mars, involves a practical comparison of sand samples and also has a downloadable data sheet.
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Each issue of 'Big Picture' comes with a sprinkling of Fast Facts, fascinating snippets of information on the topic covered.