astrobiology
#32
The habitable zone, or Goldilocks zone, can vary in size and position for different types of stars.
#46
Stratt's desire to protect Earth from extraterrestrial contamination partially reflects our own modern planetary protection efforts.
#69
Tau Ceti is a nearby solar analog star with a number of unconfirmed exoplanet candidates.
#96
Panspermia is a controversial hypothesis that leads to fun storytelling possibilities.
#150
Eridian circulatory systems operate quite differently from those of terrestrial organisms.
#165
Methane is found in the atmospheres of worlds both near and far.
#170
Astrophage have an extra step or variant in their Krebs cycle.