Related by context. Frequent words. (Click for all words.) 46 auroral 45 quanta 45 vortices 44 starbursts 44 sunspot numbers 44 X ray emission 44 filaments 43 coronal mass ejections 42 vortexes 42 cosmic rays 41 orbs 41 muons 41 nuclei 41 supernova explosions 41 gamma rays 40 cosmic ray 40 earths 40 periodicity 40 whorls 40 sunbeams 40 ionized gas 40 tracers 40 distant galaxies 39 crystals 39 iridescence 39 neutrons 39 nebulae 39 blobs 39 ejecta 39 supernova explosion 39 photons 39 striations 39 interstellar dust 39 atomic particles 38 histograms 38 orb 38 WIMPs 38 decadal 38 rays 38 auroras 38 geysers 38 filament 38 motes 37 squiggles 37 suns 37 tendril 37 dinoflagellates 37 planets orbiting 37 lavas 37 plate tectonics 37 sunspot 37 particles 37 auras 37 luminous 37 comets 37 meteoroids 37 lava rocks 37 florescent 36 correlations 36 luminosity 36 dust devils 36 astronomical objects 36 Supplementary Information 36 stalactites 36 meteors 36 thunderclouds 36 solar flares 36 clusters 36 positrons 36 electrodes 36 stalagmites 36 grids 36 cosmic 36 cumulus clouds 35 globes 35 photon 35 planets 35 gravitational waves 35 water vapor 35 galaxies 35 graphs 35 oxygen atoms 35 histogram 35 billiard balls 35 magma chamber 35 DNA strands 35 infrared rays 35 methane hydrate 35 fireballs 35 cumulus 35 photodetector 35 parabola 35 constellation Leo 35 polar caps 35 coefficients 35 concentric rings 35 volcanism 34 scarps 34 fluorescent 34 glacial melt 34 squiggly lines