Related by context. Frequent words. (Click for all words.) 61 isotope ratios 60 elemental composition 59 chemical composition 57 spectral signature 57 isotopic composition 55 amino acid sequences 55 morphologies 53 mass spectroscopy 53 oxygen isotopes 53 fluoresce 52 redshifts 52 astronomical objects 52 aerosol particles 52 melanosomes 52 microfossils 52 rocky planets 52 biomolecule 52 silicates 51 spherules 51 naturally occuring 51 zeolites 51 spectroscopic 51 particle sizes 51 quark gluon plasma 51 foraminifera 51 terrestrial planets 50 igneous rocks 50 odorants 50 osmium 50 microenvironments 50 striations 50 nanosized 50 planetary nebulae 50 gene expression profiles 50 infrared spectroscopy 50 biological molecules 50 magnetars 50 isotopic 50 muons 50 zircons 49 lunar soil 49 synthetic polymers 49 super Earths 49 stromatolites 49 morphologically 49 fluorescent dyes 49 coprolites 49 spectra 49 molecularly 49 baryons 49 microstructures 49 solar nebula 48 Galaxy Evolution 48 diatoms 48 solar corona 48 MOFs 48 WASP #b 48 abundances 48 sodium potassium 48 adsorb 48 porphyrin 48 naturally occurring substances 48 planets orbiting 48 gene expression patterns 48 moonlets 48 planets circling 48 galaxy clusters 48 Spitzer Space Telescope 48 otoliths 48 sulphates 48 analyte 48 spectrographs 48 landforms 48 metabolise 48 ejecta 48 biogenic 48 martian soil 47 Hubble observations 47 globular clusters 47 organic molecules 47 iron oxides 47 temperature salinity 47 naturally occurring compounds 47 olivine 47 potencies 47 fluorescing 47 nanodiamonds 47 distant galaxies 47 micelles 47 planetesimals 47 chemical compounds 47 elliptical galaxies 47 molecules 47 radial velocity 47 amyloid fibrils 47 atomic particles 47 Higgs particle 47 amino acids 46 visible wavelengths 46 polycyclic aromatic hydrocarbons PAHs 46 hot Jupiters