Related by context. Frequent words. (Click for all words.) 61 gravitational lensing 59 distant galaxies 59 solar corona 58 distant galaxy 57 redshift 57 spectroscopic 56 astrophysical 56 visible wavelengths 56 optical microscopy 56 shorter wavelengths 56 Crab Nebula 56 galaxy cluster 56 observable universe 56 X ray emission 55 spacetime 55 Galaxy Evolution 55 XMM Newton 55 interferometry 55 Einstein theory 55 Saturn rings 55 spatial dimensions 55 infrared wavelengths 54 Hawking radiation 54 active galactic nuclei 54 gravitational wave 54 infrared telescope 54 comet nucleus 54 Andromeda galaxy 54 Hubble observations 54 adaptive optics 54 astrophysicists 54 elliptical galaxies 54 galaxy formation 54 COROT 53 astronomical observations 53 Keck Observatory 53 magnetic reconnection 53 Earth magnetosphere 53 Gamma ray bursts 53 cosmic microwave background 53 microlensing 53 extrasolar planets 53 gamma ray burst 53 Astrophysicists 53 WMAP 53 optical microscope 53 galaxy clusters 53 WM Keck Observatory 53 galaxies 53 astronomical objects 53 magnetar 53 scanning tunneling microscope 53 ringed planet 53 accretion disk 52 general relativity 52 WFC3 52 magnifications 52 astrophysicist 52 JWST 52 frequency comb 52 interstellar dust 52 ESO Very Large Telescope 52 optical telescopes 52 attosecond 52 GRBs 52 celestial object 52 supernova remnant 52 quasar 52 photonic crystal 52 Cassini Huygens 52 optical microscopes 52 planetary scientist 51 astronomers 51 cosmologists 51 Iapetus 51 Eta Carinae 51 Type Ia supernovae 51 interplanetary spacecraft 51 Webb Telescope 51 astronomer 51 gravitational tug 51 cosmic dust 51 planetary nebulae 51 NASA Cassini spacecraft 51 supernova explosion 51 innermost planet 51 Cassini spacecraft 51 extrasolar planet 51 X ray Observatory 51 heliosphere 51 Astrophysicist 51 Lick Observatory 51 Brownian motion 51 La Silla Chile 51 tiniest particles 51 magnification 51 gravitational waves 51 quasars 50 Andromeda Galaxy 50 Planetary Laboratory 50 Resolution Imaging