Related by context. Frequent words. (Click for all words.) 69 femtosecond 63 laser pulses 61 spectroscopic 60 interferometry 60 gamma ray burst 59 spectroscopy 58 gravitational lensing 58 laser pulse 58 optical microscope 57 fluorescence microscopy 57 THz 57 redshift 56 photons 56 interferometer 56 Raman spectroscopy 56 diffraction 56 XMM Newton 56 cosmic ray 56 neutrino 55 photon 55 extrasolar planet 55 magnetization 55 gamma ray 54 adaptive optics 54 trillionth 54 electron spin 54 gamma ray bursts 54 astrophysical 53 amplitudes 53 dynamical 53 cosmic microwave background 53 quantum mechanical 53 supernovae 53 terahertz 53 neutrinos 53 electrochemical 53 IceCube 53 infrared wavelengths 53 gamma rays 53 GRBs 53 supernova explosion 52 occultation 52 galaxy cluster 52 spacetime 52 gravitational waves 52 neutrons 52 oscillation 52 fluorescence 52 spectra 52 micrometer 52 THEMIS 52 distant galaxies 52 pulsar 52 atomic particles 52 microscopy 51 infrared radiation 51 ion beam 51 quasar 51 qubit 51 WMAP 51 wavelengths 51 transmission electron microscope 51 Planck 51 atomic nuclei 51 X ray diffraction 51 Spectroscopy 51 comet nucleus 51 exoplanet 51 spatial resolution 51 excitation 51 electron volts 51 femtosecond laser 51 electron beam 51 Very Large Telescope 51 extrasolar planets 51 GOCE 51 exoplanets 50 JILA 50 magnetic fields 50 tomography 50 nanometer scale 50 cosmic rays 50 electron microscopy 50 wavelength 50 interstellar dust 50 electron 50 macroscopic 50 infrared laser 50 millionths 50 positrons 50 subatomic 50 galaxy clusters 50 nanoscale 50 electron microscope 50 perigee 50 atoms 49 biomolecular 49 scanning electron microscope 49 subatomic particles 49 ionosphere 49 astronomers