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Astrum
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astrum
astronomy
space
astrobiology
astrophysics
microbes
Alien life
the search for alien life
space science
ancient organisms
habitable zone
exoplanets
Great Oxidation Event
cyanobacteria
biosignature
methane
bacteriorhodopsin
Purple earth
Extremophiles
biochemistry
Exophiala
Halobacterium lacusprofundi
Europa
BIOMEX
ESA
ISS
International Space Station
ancient microbes
Gusev crater
Spirit Rover
NASA
HabEx
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