Related by context. Frequent words. (Click for all words.) 62 astrobiologists 61 microenvironments 60 habitable planets 60 terrestrial planets 59 morphologies 58 Higgs particle 58 lava tubes 58 organic molecules 58 rocky planets 57 landforms 57 microlensing 57 Cyanobacteria 57 biological molecules 57 microfossils 57 planetary nebulae 56 foraminifera 56 astronomical objects 56 ribonucleic acid RNA 56 Snowball Earth 56 igneous rocks 56 Meridiani 56 moon Europa 55 habitable zones 55 chirality 55 lake sediments 55 extremophiles 55 hydrothermal vent 55 hydrothermal activity 55 optical wavelengths 55 terrestrial ecosystems 55 stromatolites 55 multicellular organisms 55 abundances 54 elemental composition 54 Gliese #g 54 hydrothermal vents 54 Hubble observations 54 Martian rocks 54 GRBs 54 Lake Vostok 54 super Earths 54 isotopic composition 54 solar corona 54 Cepheids 53 Metamaterials 53 infrared wavelengths 53 marine sediments 53 nanosized 53 Type Ia supernovae 53 extrasolar planets 53 microbiome 53 aurorae 53 isotope ratios 53 planets 53 silicates 53 spectral signature 53 lunar poles 53 Martian surface 53 isotopic 53 nanomechanical 53 nanoscale structures 53 multicellular 52 spectroscopic 52 fossils 52 spectral signatures 52 zeolites 52 paleoclimate 52 Oort Cloud 52 molecular interactions 52 zircons 52 magmas 52 Archaea 52 methanogens 52 high temperature superconductivity 52 oxygen isotopes 52 osmium 52 biogeochemical 52 Earth asteroids 52 galaxy formation 52 redshifts 52 volcanism 52 nanosensors 52 dinoflagellates 52 scarps 52 magnetars 52 XMM Newton 51 globular clusters 51 perovskite 51 geomagnetic 51 archaea 51 lunar soil 51 cometary 51 biomolecule 51 WIMPs 51 alien civilizations 51 biochemical processes 51 Haumea 51 planetesimals 51 epigenome 51 magnetic reconnection 51 photonic crystals