Related by context. Frequent words. (Click for all words.) 66 helium atoms 65 photosphere 63 X ray emission 63 ionize 62 ionized gas 61 accretion disk 61 active galactic nuclei 61 solar corona 61 shorter wavelengths 61 Gamma rays 60 ionised 60 electrically conducting 60 protoplanetary disk 59 Ultraviolet light 59 protostar 59 electron beams 59 diffracted 59 alpha particles 58 Cepheids 58 fluorescing 58 Gamma ray bursts 58 WASP #b 58 plasmon 58 ultraviolet wavelengths 58 photometer 58 Solar flares 58 diffraction pattern 58 red supergiant 58 gamma rays 57 ultracold 57 muons 57 nanobubbles 57 Cosmic rays 57 stellar nurseries 57 ionisation 57 infrared radiation 57 collimated 57 surface plasmons 57 rubidium atoms 56 laser pulse 56 galaxy NGC 56 antiprotons 56 supernova explosions 56 Martian dust 56 gravitational lens 56 supernova explosion 56 infrared wavelength 56 gaseous planets 55 photodetector 55 magnetic flux 55 exosphere 55 silicates 55 magnetic fields 55 photochemistry 55 ultraviolet light 55 manganese oxide 55 photoluminescence 55 Photons 55 semiconductor nanocrystals 55 protostars 55 planetary nebulae 55 interstellar dust 55 radial velocity 55 interstellar medium 55 Quantum dots 55 icy moons 55 moon Enceladus 55 plasmons 55 atomic nuclei 55 photons 55 particle detectors 55 Hawking radiation 55 pulsed laser 55 excitons 55 comet tail 55 orbiting planets 55 cesium atoms 54 microwave radiation 54 visible wavelengths 54 Ultraviolet radiation 54 planetesimals 54 substorm 54 -# degrees Fahrenheit [002] 54 subatomic particles 54 magnetar 54 magnetars 54 corona 54 nebulae 54 neutrons 54 solar nebula 54 neutron star 54 nitrogen atoms 54 X ray beams 54 force microscopy AFM 54 ionizing 54 electron spins 54 exciton 54 fluoresces 54 dye molecules 53 gravitational interactions 53 electrochemically