Related by context. Frequent words. (Click for all words.) 50 planetary nebulae 49 Filippenko 48 Astrophysicist 48 supernova remnants 47 Gehrels 46 Carilli 46 Poinar 46 XMM Newton 46 CfA 46 galaxy formation 46 Cepheids 45 Kuiper belt 45 globular clusters 45 dwarf galaxy 45 solar corona 45 magnetars 45 habitable planets 45 GRBs 45 Wouk 45 distant galaxy 45 astronomical objects 44 galaxies 44 active galactic nuclei 44 pulsars 44 dwarf galaxies 44 brown dwarfs 44 elliptical galaxies 44 planetary nebula 44 exoplanets 44 Lick Observatory 44 WASP #b 44 extrasolar planets 44 interstellar dust 44 astronomers 44 Hubble observations 44 van Dokkum 43 terrestrial planets 43 Planck 43 Changizi 43 Galaxy Evolution 43 supernovae 43 magnetar 43 extrasolar planet 43 supernova explosion 43 Edwin Hubble 43 SIRTF 43 Bahcall 43 Figer 43 astronomical observations 43 brown dwarf 42 habitable planet 42 Tomasko 42 God Particle 42 astrobiologists 42 supernova explosions 42 Andromeda galaxy 42 Smrekar 42 Keck telescope 42 cosmologists 42 nebulae 42 neutron stars 42 Gamma ray bursts 42 Earthlike 42 protoplanetary disk 42 quasars 42 Astrophysicists 42 VLBI 42 X ray emission 42 Phaethon 42 planets circling 42 Orion Nebula 42 Paabo 42 Hawking radiation 41 Cosmologists 41 distant galaxies 41 galaxy clusters 41 Oort Cloud 41 innermost planet 41 planetary science 41 quantum optics 41 Spitzer Space Telescope 41 Mauna Kea Hawaii 41 Niels Bohr Institute 41 supernovas 41 Lowell Observatory 41 moonlets 41 redshifts 41 Pasachoff 41 redshift 41 GRB # 41 Cancri 41 globular cluster 41 Mandelbrot 41 Szilard 41 WMAP 41 Gliese #g 41 HD #b [002] 41 gravitational lensing 40 alien civilizations 40 Voyager spacecraft 40 super Earths