Related by context. Frequent words. (Click for all words.) 66 Hubble observations 65 optical wavelengths 64 photometry 64 astronomical observations 63 Cepheids 63 interferometric 63 spectroscopic 62 interferometry 61 spectrographs 61 solar corona 60 interferometers 60 elemental composition 60 XMM Newton 60 numerical simulations 59 Computer simulations 59 ESO Very Large Telescope 59 radial velocity 59 optical microscopy 59 spectra 59 X ray emission 58 planetary nebulae 58 anisotropy 58 VLBA 58 astronomical objects 58 visible wavelengths 58 WM Keck Observatory 58 NASA Cassini spacecraft 58 morphologies 58 redshifts 58 NASA ESA Hubble 58 auroral 58 microlensing 57 photometer 57 spectrometry 57 biogeochemical 57 gravitational lensing 57 ionospheric 57 infrared wavelengths 57 frequency comb 57 neutron scattering 56 abundances 56 Voyager spacecraft 56 spatial resolution 56 photometric 56 wavelengths 56 distant galaxies 56 isotopic composition 56 Very Large Telescope 56 transmission electron microscopy 56 electron density 56 Remote sensing 56 gravitational wave 56 oxygen isotopes 56 galaxy formation 56 confocal microscopy 55 interferometer 55 magnetic fields 55 microfossils 55 isotopic 55 HiRISE camera 55 nanomechanical 55 VLBI 55 radiative 55 radiometer 55 celestial bodies 55 microwave radiation 55 photonic crystal 55 WFPC2 55 WFC3 55 NICMOS 55 infrared spectroscopy 55 COROT 55 Galileo spacecraft 55 fluorophores 55 magnetic reconnection 55 spectroscopy 54 gravitational waves 54 laser pulses 54 shorter wavelengths 54 active galactic nuclei 54 astrophysical 54 interplanetary spacecraft 54 aurorae 54 optical telescopes 54 neutrino 54 spectral 54 quantum entanglement 54 Keck Observatory 54 keV 54 Earth magnetosphere 54 plasmons 54 bathymetry 54 multispectral 54 WMAP 54 CRISM 54 electron spins 54 Very Large Array 54 occultation 54 scanning electron microscope 54 supernova remnant 53 galaxy clusters