Related by context. Frequent words. (Click for all words.) 65 velocity 57 conductance 56 speeds 56 redshift 55 magnetic fields 54 amplitude 54 vortices 53 gravitational 53 deformation 53 densities 53 spectra 53 diameters 52 oscillations 51 intensities 51 luminosity 51 trajectories 51 supersonic speeds 50 orbits 50 cosmic rays 50 photons 50 conductivity 50 galaxy clusters 49 particles 49 apertures 49 neutron star 49 coefficients 49 refractive index 49 geometries 49 atoms 49 centrifugal force 49 electrons 49 permeability 49 μm 49 neutrons 49 gamma rays 49 gravitational waves 49 viscosity 49 dynamical 49 diffraction 48 electron 48 spatial resolution 48 altitudes 48 fluxes 48 laser pulses 47 wavelengths 47 distant galaxies 47 subatomic particles 47 nuclei 47 attenuation 47 hydrodynamic 47 quasar 47 supernovae 47 neutron stars 47 excitation 47 latitudes 47 thermal conductivity 47 ions 46 galaxies 46 infrared radiation 46 brown dwarfs 46 helical 46 spherical 46 ionosphere 46 refraction 46 axial 46 magnetosphere 46 accelerations 46 cubic centimeter 46 accuracies 46 electrical conductivity 45 troposphere 45 protons 45 infrared wavelengths 45 repeatability 45 convection 45 general relativity 45 harmonics 45 gradients 45 gradient 45 proton 45 gravity 45 relativistic 45 particle size 45 reflectance 45 interstellar space 45 dispersion 45 updrafts 45 diameter 45 psi 44 supermassive black holes 44 nebula 44 quantum mechanical 44 vibrational 44 supermassive black hole 44 photon 44 airflow 44 distances 44 deformations 44 density 44 spectral 44 atmospheric