Related by context. Frequent words. (Click for all words.) 67 gaseous planets 66 photosphere 65 icy moons 62 solar corona 61 Jupiter Saturn 60 innermost planet 60 VIRTIS 59 polar craters 59 infrared telescopes 59 chromosphere 59 ultraviolet wavelengths 59 X ray telescopes 58 infrared wavelength 58 exosphere 58 planets orbiting stars 58 galactic cosmic rays 58 HD #b [002] 58 elliptical orbits 57 Gamma ray bursts 57 aurorae 57 constellation Virgo 57 substorm 57 Earthlike planets 56 solar nebula 56 Earthlike 56 undersea volcanoes 56 Earth magnetosphere 56 lunar poles 56 visible wavelengths 56 mesosphere 56 comet nucleus 56 Jupiter Saturn Uranus 56 unaided eye 56 Oort cloud 56 X ray emission 56 lunar craters 56 moon Charon 56 magnetars 56 sun corona 56 Kuiper belt 56 By Riva Froymovich 56 chondrules 56 celestial equator 56 laser altimeter 55 Saturn moon Enceladus 55 Gamma rays 55 globular star 55 Epsilon Eridani 55 spectrographs 55 BY VINCENT MAO 55 helium atoms 55 red supergiant 55 protoplanetary disk 55 Cassini orbiter 55 magnetosphere 55 Galileo spacecraft 55 moon Enceladus 55 planet orbits 55 interstellar clouds 55 Solar flares 55 asteroid Vesta 55 Oort Cloud 55 Kepler #b 55 polar vortex 55 protostars 55 magnetic reconnection 54 By Tom Polansek 54 planetesimals 54 constellation Taurus 54 planet Uranus 54 jarosite 54 optical wavelengths 54 By Candia Dames 54 perihelion 54 Carina Nebula 54 extrasolar 54 habitable zones 54 Ultraviolet radiation 54 masers 54 protoplanetary disks 54 AGNs 54 heavily cratered 54 protostar 54 By HARVEY SIMPSON 54 Voyager spacecraft 54 submillimeter 54 ringed planet 54 Cosmic rays 53 NASA Cassini spacecraft 53 planetary nebulae 53 heliopause 53 interplanetary spacecraft 53 infrared wavelengths 53 stellar nurseries 53 carbonate minerals 53 NASA Spacecraft 53 XMM Newton 53 martian soil 53 coronagraph 53 gravitational lens 53 planetary nebula