Related by context. Frequent words. (Click for all words.) 57 microscopic organisms 56 hydrothermal vents 55 archaea 55 astrobiologists 54 single celled 53 organisms 53 terrestrial planets 52 microbes 52 marine organisms 51 diatoms 51 microorganisms 51 rocky planets 51 single celled organisms 51 microorganism 51 Archaea 50 Microorganisms 50 lifeforms 50 organic molecules 48 hot Jupiters 48 super Earths 48 high temperature superconductors 48 cyanobacteria 47 sea squirts 47 biological molecules 47 geological formations 47 organism 47 fossils 47 astrobiologist 47 lichens 46 microbe 46 subduction zones 46 extrasolar planet 46 methane hydrates 46 multicellular 46 diatom 46 nitrogen fixation 46 seamounts 46 biota 46 alga 46 pikas 45 species 45 scientists 45 biodiversity hotspots 45 nitrogen fixing 45 high temperature superconductivity 45 microclimates 45 Astrobiology 45 micro organisms 44 biochemical processes 44 creatures 44 corals 44 evolutionary biologists 44 discoveries 44 organic compounds 44 baleen whales 44 biosphere 44 moon Europa 44 extrasolar planets 44 Microbes 44 microscopic algae 44 Organisms 44 astronomical objects 44 superfluidity 44 microbial 44 morphologies 44 megafauna 43 gas hydrates 43 temperate zones 43 mammals 43 fungi 43 biomolecules 43 sea squirt 43 bioactive compounds 43 eukaryotes 43 salamanders 43 taxonomists 43 marine ecosystems 43 geologically active 43 salt tolerant 43 Adult stem cells 43 eukaryotic 43 olivine 43 keystone species 43 astrobiology 42 plesiosaur 42 meteorites 42 benthic 42 primordial soup 42 habitability 42 plate tectonics 42 zooplankton 42 intertidal 42 zeolites 42 exoplanets 42 vertebrate species 42 biodiverse 42 biologists 42 biogenic 42 aquatic creatures 42 brown dwarfs 42 mammal