Related by context. Frequent words. (Click for all words.) 55 muon 54 muons 53 subatomic particle 52 particle 52 magnetar 51 gamma rays 51 gravitational wave 51 gamma ray burst 50 cosmic rays 50 aerosol particles 50 comet nucleus 50 laser pulses 50 photon 50 infrared spectrometer 49 particle beam 49 laser pulse 49 mass spectroscopy 49 celestial object 49 gamma ray 49 alpha particles 48 WIMPs 48 cosmic ray 48 optical telescopes 48 X ray beam 48 Earth magnetosphere 48 pulsations 48 pulsar 48 particles 48 Brownian motion 48 astronomical objects 48 photons 48 protons 47 atomic particles 47 subatomic 47 positron 47 XMM Newton 47 Photons 47 atoms 47 distant galaxy 47 planet orbiting 47 subatomic particles 47 extrasolar planet 47 spectrometer 47 neutrons 47 spectroscopic 46 neutrino 46 wavelengths 46 gravitational waves 46 particle beams 46 accretion disk 46 HD #b [002] 46 pulsars 46 X ray emission 46 Raman spectroscopy 46 spectrometers 46 mass spectrometer 46 magnetic fields 46 ejecta 46 supernova remnant 46 interstellar dust 46 GRBs 46 meteoroids 46 GeV 46 distant galaxies 45 galaxy cluster 45 Eta Carinae 45 Crab Nebula 45 electron beams 45 neutron star 45 infrared radiation 45 photonic crystal 45 supersymmetry 45 bosons 45 meteoroid 45 electrons 45 COROT 45 millionths 45 auroral 45 infrasound 45 quasar 45 resonant frequency 45 auroras 45 ionized gas 45 gamma ray bursts 45 positrons 45 magnetosphere 45 oscillations 45 exhaled breath 45 orbits 44 comet dust 44 sunspot cycle 44 magnetic flux 44 exoplanets 44 vibrational 44 interferometry 44 picosecond 44 hydrogen atoms 44 Spectrometer 44 multispectral 44 infrared wavelengths 44 plasmons