Related by context. Frequent words. (Click for all words.) 62 XMM Newton 61 spectroscopic 61 gravitational lensing 59 X ray emission 59 numerical simulations 58 astronomical observations 58 Hubble observations 57 redshifts 57 active galactic nuclei 57 spectra 57 astronomical objects 56 redshift 56 radial velocity 55 GRBs 55 interferometry 55 anisotropy 55 gravitational wave 55 Type Ia supernovae 55 ESO Very Large Telescope 55 infrared spectroscopy 55 photometric 54 elliptical galaxies 54 WM Keck Observatory 54 infrared wavelengths 54 quasars 54 confocal microscopy 54 supernovae 54 distant galaxies 54 planetary nebulae 53 globular clusters 53 synchrotron radiation 53 galaxy clusters 53 X ray diffraction 53 optical microscopy 53 auroral 53 visible wavelengths 53 cosmic microwave background 53 neutron scattering 53 frequency comb 52 EEGs 52 attosecond 52 wavefront 52 microlensing 52 galaxy formation 52 supernova remnant 52 GRB # 52 spectroscopy 52 supernova remnants 52 NICMOS 52 astrophysical 52 confocal 52 magnetar 52 WMAP 51 electron density 51 NASA Chandra 51 Hawking radiation 51 interstellar dust 51 HRSC 51 scanning electron microscope 51 ionospheric 51 mammographic 51 IRAS 51 fluorescing 51 gravitational waves 51 dynamical 51 Crab Nebula 50 galaxies 50 NASA ESA Hubble 50 FRET 50 morphologies 50 quantitative measurements 50 voxel 50 measurements 50 pulsars 50 mass spectroscopy 50 optical telescopes 50 NMR spectroscopy 50 optical microscopes 50 laser pulses 50 colorimetric 50 antiprotons 50 WIMPs 50 optical microscope 50 Very Large Array 50 theoretical calculations 50 VLBI 50 CIRS 50 spiral galaxies 50 ion beam 50 astronomers 50 solar corona 50 ionisation 50 Voyager spacecraft 50 microarray analysis 49 nebulae 49 Positron Emission Tomography PET 49 extrasolar planets 49 solar irradiance 49 quantum entanglement 49 COROT 49 spectrometry