Related by context. Frequent words. (Click for all words.) 66 angstrom 66 angstroms 63 micrometer 62 micrometres 61 μm 61 picoseconds 60 #.#μm [001] 60 magnifications 60 GeV 59 #μm [002] 59 photodetector 59 isotropic 59 CCD camera 59 spatial resolution 59 z = 59 electron density 58 photometry 58 redshift 58 #.#nm [001] 58 photometer 58 absorbance 58 radial velocity 58 anisotropy 58 visible wavelengths 58 femtoseconds 58 diameter 57 magnification 57 planet orbits 57 picosecond 57 MeV 57 redshifts 57 observable universe 57 parallax 57 #μm [001] 57 comet nucleus 56 microns 56 millionths 56 radii 56 nanometers nm 56 spatial dimensions 56 megapixel CCD sensor 56 millimeter 56 emissivity 56 #.#mm [002] 56 Fig. 1A 55 trillionths 55 μs 55 aperture 55 pixel 55 wavefront 55 ellipse 55 unaided eye 55 femtosecond 55 amplitudes 55 brightness 55 micrometers 55 optical microscope 55 attosecond 55 shorter wavelengths 55 exciton 55 galaxy cluster 55 X ray emission 54 irradiance 54 oblique angle 54 infrared wavelengths 54 nanometers 54 #/#th [001] 54 GPa 54 interferometry 54 perigee 54 laser pulse 54 supernova remnant 54 hemispherical 54 noise ratio SNR 54 photonic crystal 54 interferometer 54 anisotropic 54 XMM Newton 53 spiral galaxy 53 multispectral 53 cm2 53 spectra 53 centimeter 53 surface roughness 53 kelvin 53 frequency comb 53 Andromeda galaxy 53 X ray beam 53 ppm U 53 WFC3 53 velocities 53 refractive index 53 NICMOS 53 diffraction 53 milliwatt 53 maximum aperture 53 extrasolar planet 53 GRB # 53 #mm #mm [002] 53 ecliptic 53 star Gliese