Related by context. Frequent words. (Click for all words.) 66 cosmological constant 57 X ray emission 56 Bose Einstein condensate 56 WIMPs 55 spacetime 55 fermions 55 superfluid 54 excitons 54 Brownian motion 54 quark gluon plasma 54 subatomic particle 53 sunspot cycle 52 magnetar 52 supersymmetry 51 accretion disk 51 elliptical galaxies 51 dynamical 51 HD #b [002] 51 supernova explosion 51 atoms 51 atomic nuclei 51 galaxy cluster 51 subatomic 51 isotropic 51 quantum mechanics 51 quantum theory 51 galaxy formation 51 planet orbits 50 neutrino 50 general relativity 50 radioactive decay 50 superposition 50 sunspot activity 50 gravitational lensing 50 ionized gas 50 GeV 50 quantum gravity 50 muon 50 cosmologists 50 quantum mechanical 50 nuclei 50 magnetic fields 50 quasar 50 electromagnetism 49 qubit 49 electron beams 49 angular momentum 49 photon 49 magnetic flux 49 GRBs 49 anisotropy 49 laser pulse 49 Einstein theory 49 galaxy clusters 49 neutron star 49 entropy 49 picosecond 49 rocky planets 49 irradiance 49 electrons 49 cosmic microwave background 48 luminosity 48 spiral galaxies 48 photons 48 pulsations 48 particle 48 extrasolar planet 48 bandgap 48 Eta Carinae 48 atomic particles 48 magnetization 48 superconductor 48 high temperature superconductors 48 positron 48 Gliese #g 48 gravitational 48 subatomic particles 48 universe 48 quantum physics 48 crystalline structure 48 cosmological 48 X ray beam 47 Kuiper belt 47 pulsar 47 atomic nucleus 47 Gaussian 47 protons 47 phonons 47 alpha particles 47 photonic crystal 47 crystal lattice 47 supernova explosions 47 Earth magnetosphere 47 gravitational waves 47 cosmic ray 47 neutron stars 47 constellation Leo 47 Crab Nebula 47 Uranus 47 relativistic 47 electron volts