Related by context. Frequent words. (Click for all words.) 63 planetary nebulae 60 baryons 60 elliptical galaxies 60 active galactic nuclei 59 galaxy formation 59 supermassive black holes 58 dynamical 58 Cepheids 58 bosons 58 supernova remnants 58 planetesimals 57 galaxy clusters 57 colliding galaxies 57 brown dwarfs 57 terrestrial planets 57 nuclei 57 dwarf galaxies 57 globular clusters 57 GRBs 57 globular cluster 56 hot Jupiters 56 singularities 56 super Earths 56 galaxies 56 neutron stars 55 solar nebula 55 magnetars 55 WIMPs 55 spatial dimensions 55 WASP #b 55 Type Ia supernovae 55 Jupiter Saturn 55 fermions 54 electron spins 54 spacetime 54 Bose Einstein condensate 54 neutron star 54 dimers 54 nebulae 54 quanta 54 Gamma ray bursts 54 X ray emission 54 excitations 54 excitons 54 atomic nuclei 54 dwarf galaxy 54 Oort Cloud 54 vortices 54 spiral galaxies 54 planetary nebula 53 morphologies 53 Earth magnetosphere 53 accretion disk 53 dipoles 53 redshifts 53 atoms 53 numerical simulations 53 interstellar medium 53 GeV 53 Hubble observations 53 optical wavelengths 53 exciton 53 brown dwarf 53 rocky planets 53 ionized gas 53 gravitationally 53 nanosized 53 quasar 53 conformations 52 interstellar dust 52 Photons 52 habitable zones 52 porphyrin 52 antiprotons 52 Kuiper belt 52 Kuiper Belt objects 52 accreting 52 gravitational waves 52 supersymmetry 52 osmium 52 supernova explosions 52 phonons 52 radial velocity 52 magnetic reconnection 51 solar corona 51 aerosol particles 51 quark gluon plasma 51 hydrogen atoms 51 interferometers 51 Astrophysicists 51 supernovae 51 Andromeda Galaxy 51 gravitational attraction 51 reactants 51 superfluid 51 colliders 51 planets 51 interplanetary spacecraft 51 quasars 51 magnetosphere 51 orbitals