Related by context. Frequent words. (Click for all words.) 71 cosmologists 69 Astronomers 64 astrophysicists 64 Physicists 62 astronomers 61 Theorists 61 physicists 60 cosmic microwave background 59 GRBs 58 galaxy clusters 58 Scientists 57 X ray Observatory 56 quasars 56 rocky planets 56 Einstein theory 55 distant galaxies 55 gravitational lensing 55 spacetime 55 cosmological 54 brown dwarfs 54 gamma ray bursts 54 gravitational waves 54 elliptical galaxies 54 galaxy cluster 54 cosmology 53 Saturn rings 53 Big Bang theory 53 antimatter 53 WMAP 53 neutron stars 53 subatomic 53 globular clusters 53 subatomic particles 53 galaxies 53 Mathematicians 53 redshift 53 supernova explosion 53 HD #b [002] 53 quasar 53 distant galaxy 52 supernovae 52 atomic particles 52 quantum mechanics 52 comet nucleus 52 gamma ray burst 52 Seismologists 52 Higgs boson 52 extrasolar planets 52 quantum physics 52 cosmologist 52 supernovas 52 XMM Newton 52 Geneticists 51 general relativity 51 universe 51 Anthropologists 51 dwarf galaxies 51 NASA Chandra 51 optical telescopes 51 Geologists 51 Neuroscientists 50 particle physics 50 astrophysical 50 Saturn moons 50 planets 50 seismologists 50 atomic nuclei 50 cosmic 50 Climatologists 50 radioactive decay 50 Boffins 50 supernova 50 cosmic rays 50 supernova explosions 49 Researchers 49 heliosphere 49 CMEs 49 neutron star 49 cosmic ray 49 high temperature superconductors 49 neutrinos 49 neutrino 49 particle accelerators 49 dynamical 49 theorists 49 exoplanets 49 quantum theory 49 extrasolar planet 49 scientists 49 terrestrial planets 49 pulsars 48 planetary scientist 48 astrophysics 48 Planck 48 planets orbiting 48 quantum mechanical 48 pulsar 48 interferometry 48 theoretical physicist 48 gamma rays 48 particle accelerator