Related by context. Frequent words. (Click for all words.) 56 WASP #b 55 ellipsoid 54 Crab Nebula 54 planetary nebulae 53 Eta Carinae 53 Cepheids 53 moonlets 53 magnetars 53 planet Uranus 52 Oort cloud 52 active galactic nuclei 52 particle detectors 52 Hawking radiation 52 geoid 52 helium atoms 52 Higgs particle 52 Eagle Nebula 51 galaxy NGC 51 red supergiant 51 gravitational lensing 51 Oort Cloud 51 SIRTF 51 planet orbits 51 Carina Nebula 51 X ray emission 51 brown dwarfs 51 Keck telescope 51 protostar 51 stellar nurseries 51 photonic crystal 51 moon Enceladus 51 magnetar 51 hot Jupiters 51 lunar craters 51 Galaxy Evolution 51 boson 51 galaxy formation 50 radial velocity 50 IceCube 50 protoplanetary disks 50 interstellar clouds 50 exosphere 50 supernova explosions 50 HD #b [002] 50 Martian dust 50 superlens 50 negative refraction 50 globule 50 perfectly symmetrical 50 XMM Newton 50 gravitational lens 50 lunar soil 50 astronomical telescope 50 Gliese #g 50 Exoplanet 50 observable universe 49 ultraviolet wavelengths 49 icy moons 49 protostars 49 distant galaxy 49 supercomputer simulations 49 Hubble observations 49 HAT P 49 sea scorpion 49 Saturn rings 49 Phaethon 49 subatomic particle 49 Changizi 49 gravitational wave 49 interferometers 49 spherical 49 Olympus Mons 49 R#a# 49 conical shape 49 Andromeda galaxy 49 microlensing 49 Betelgeuse 49 geodesic 49 accretion disk 49 supernova explosion 49 COROT 49 planetary nebula 49 interplanetary spacecraft 49 dwarf galaxy 49 Galileo spacecraft 49 photometer 49 Type Ia supernovae 48 God Particle 48 LOFAR 48 frequency comb 48 plasmon 48 scanning tunneling microscope 48 attosecond 48 elemental composition 48 Tycho Brahe 48 Mimas 48 infrared telescope 48 planetesimals 48 photosphere 48 planetoid 48 muon