The image above shows the the spiral formation of a moss culture gown during the 2003 Space Shuttle missions. Researchers suspect that those spirals resulted from a residual spacing mechanism intended to control colony growth and the distribution of branches, a mechanism that is normally suppressed by the stronger influence of gravity on earth. (Image courtesy of Volker Kern)
An image of the common roof moss (Ceratodon purpureus) used in the experiments aboard both Columbia missions. Additional information on the plant is available from the Ohio University Bryophyte Home Page. (Image courtesy of Fred Sack)
Moss grew in these canisters while in orbit. These particular canisters were recovered by ground crews after the 2003 Space Shuttle Columbia disintegrated upon reentry into Earth's orbit. (Image courtesy of David Reed)
Moss were grown inside the canisters in these small, square Petri dish fixation units, which allowed for chemical fixation in microgravity. (Image courtesy of David Reed)

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