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(Click for frequent words.) 67 Borexino 65 CDMS II 64 NOvA 64 Main Injector Neutrino 63 ATLAS detector 63 DZero 62 MiniBooNE 62 KamLAND 62 Collider Detector 61 Laser Interferometer Gravitational Wave 61 EPOCh 61 BaBar 61 IceCube 61 SSRL 61 Keck Interferometer 60 neutrino oscillation 60 MINOS experiment 60 EarthScope 60 Forschungszentrum Dresden Rossendorf FZD 60 neutrino experiment 60 Convection Rotation 60 CDMS experiment 60 Astrophysics Cambridge Mass. 60 Kepler Mission 60 LIGO 59 NanoSIMS 59 Pascale Ehrenfreund 59 LHCb 59 Astrophysics MOA 58 Dmitri Denisov 58 Sushil Atreya 58 neutrino detectors 58 neutrino oscillations 58 CERN LHC 58 ESO VLT 58 geoneutrinos 58 LOFAR 58 gravitational wave 58 LSND 58 supersymmetric particles 58 antineutrino 58 Gravitational Physics 58 particle detector 58 exoplanetary 58 muon 58 antihelium 4 58 Compact Muon Solenoid 58 Francis Halzen 58 COUPP 57 DZero experiment 57 Fermi LAT 57 JILA 57 SDSS II 57 cosmological observations 57 ATLAS experiment 57 COROT 57 ASPERA 57 JLab 57 Ferenc Krausz 57 BaBar experiment 57 Steward Observatory 57 JINR 57 Super Kamiokande 57 muon neutrino 57 supercomputer simulations 57 neutron spectrometer 56 Theodor Hänsch 56 ESA Integral 56 Physikalisch Technische Bundesanstalt PTB 56 Compact Muon Solenoid CMS 56 MicroFUN 56 COBE 56 SEGUE 56 Peter Jenniskens 56 ESO telescope 56 Cassini Huygens 56 ChemCam 56 microlensing 56 Fermi telescope 56 DIXI 56 Planetary Transits 56 Lunar Laser Ranging 56 NASA Wilkinson Microwave 56 Microlensing Observations 56 Electron Microscopy 56 Fermilab Tevatron 56 SPICAM 56 Astrophysical 56 tau neutrino 56 particle detectors 56 protons collide 56 Spectrometer 56 Optical Gravitational Lensing Experiment 56 particle physics experiments 56 DZero collaboration 56 MARSIS 56 Ellen Stofan 56 neutrino experiments 56 RHESSI 56 Halzen 56 INMS 55 European XFEL 55 planetary Transits 55 Dan Werthimer 55 Laboratory NSCL 55 Spectrograph 55 SUSY 55 extrasolar 55 Gal Yam 55 VIRTIS 55 NIRCam 55 beamline 55 GFZ 55 LCLS 55 interferometer 55 HIAPER 55 gravitational microlensing 55 EVLA 55 Anthony Remijan 55 Climate Experiment GRACE 55 transiting exoplanets 55 Richard Mushotzky 55 CfA 55 NSLS 55 Microlensing Follow Up 55 photoelectron spectroscopy 55 ARPES 55 Alycia Weinberger 55 proton decay 55 neutrino physics 55 infrared interferometry 55 EPOXI 55 RHIC 55 SNOLAB 55 detect gravitational waves 55 polarimetric 55 Electron Microscope 55 gamma ray spectrometer 55 electron neutrinos 55 Planetology 55 Garching Germany 55 FORCAST 55 Wide Angle Search 55 Mars Climate Sounder 55 radial velocity measurements 55 LHC experiments 55 AERONET 55 gamma ray observatory 55 muon neutrinos 55 Spectroscopic 55 CUDOS 55 DESY 54 Interferometric 54 rocky extrasolar planet 54 O OREOS 54 MINOS detector 54 astrometric 54 OSIRIS 54 Beamline 54 APXS 54 Planck satellite 54 spectroscopically 54 extrasolar planetary systems 54 antineutrinos 54 ESA XMM Newton 54 XENON# [002] 54 NASA Goddard 54 Astrophysical Research 54 THEMIS satellites 54 Fermi Gamma ray 54 UCO Lick 54 Delia Milliron 54 Manchester Jodrell Bank 54 Radioastronomy 54 CERN physicists 54 sterile neutrino 54 Rainer Klement 54 tau neutrinos 54 Earthscope 54 Keck Observatory 54 Tod Strohmayer 54 Nuclear Magnetic Resonance 54 synchrotron X ray 54 ion microprobe 54 particle astrophysics 54 Bajcsy 54 Light Microscopy 54 neutron beam 54 Space Physics 54 Energy Stereoscopic 54 weak gravitational lensing 54 quantum chromodynamics 54 NIRSpec 54 Adaptive Optics 54 X ray spectrometer 54 Lawrence Krauss 54 boson 54 ENCODE 54 Ulrich Dahmen 54 polarimetry 54 Franck Marchis 54 supersymmetric 54 radio occultation 54 Nima Arkani Hamed 54 UKIRT 54 USArray 54 spectroscopic 54 Mössbauer 54 LMU Munich 54 J# +# [002] 54 cryo EM 54 Cryogenic Dark Matter 54 spectroscopic analysis 54 Hakan Svedhem 54 SDSS III 54 Sigurd Hofmann 54 antihydrogen 54 angle resolved photoemission 54 exo planet 54 Maciej Konacki 54 JDEM 54 Fraunhofer ISE 54 neutrino detector 54 Conductivity Analyzer MECA 53 X ray telescopes 53 MPIfR 53 THEMIS mission 53 Higgs bosons 53 UVOT 53 Submillimeter Array 53 Composite Infrared Spectrometer 53 SNfactory 53 radial velocity technique 53 NASA THEMIS 53 Japan NAOJ 53 Nanoscale Materials 53 NASA WMAP 53 Fermilab accelerator 53 ultracold atoms 53 XFEL 53 ASTRON 53 Neils Bohr 53 Plate Boundary 53 ray Space Telescope 53 Quanterix 53 Faint Object 53 Nikku Madhusudhan 53 Deep Impact Principal Investigator 53 linear collider 53 Gerhard Neukum 53 HiRISE image 53 ALICE experiment 53 Katlenburg Lindau Germany 53 NASA Astrobiology 53 Higgs singlet 53 distant supernovae 53 Large Hadron 53 spectroscopic observations 53 Quantum Institute JQI 53 THEMIS 53 CALIPSO 53 NASA astrobiology 53 AAVSO 53 Ångström 53 Helioseismic 53 Hubble Near Infrared 53 neutrino beam 53 quantum cascade lasers 53 Anisotropy Probe 53 Krimigis 53 VLTI 53 NOAA ESRL 53 Werthimer 53 GEO# 53 Extrasolar Planet Observation 53 superheavy elements 53 antiprotons 53 ESRF 53 astrometry 53 spectrographic 53 SQUIDs 53 interferometric 53 type Ia supernovae 53 Stanford Synchrotron Radiation Lightsource 53 INTEGRAL 53 Cosmic Evolution 53 NASA Cosmic Background 53 RXTE 53 Quantum Computing 53 positron 53 Astrophysics CfA 53 NASA Far Ultraviolet 53 Total Ozone Mapping 53 Spaceguard 53 Synchrotron Radiation 53 Soudan Underground Laboratory 53 Jülich 53 MIRTHE 53 Carnegie Institution Geophysical 53 RIVA D. 53 WMAP satellite 53 NuSTAR 53 microlensing events 53 Rainer Blatt 53 LBNL 53 laser spectroscopy 53 Mastcam 53 COBE satellite 53 neutralinos 53 proton proton collisions 53 Proba 2 53 astrophysical phenomena 53 Atacama Large Millimeter Array 53 detect neutrinos 53 millimeter wavelengths 53 Rosetta orbiter 53 Martian meteorites 53 martian meteorites 52 Laboratory SSRL 52 European Synchrotron Radiation 52 Extraterrestrial Physics 52 STScI 52 optical interferometry 52 SPIRE instrument 52 cosmic ray 52 EarthCARE 52 Light Scattering 52 Auger Observatory 52 Paleoclimate 52 orbiting gamma ray 52 Sasselov 52 Hubble Space Telescope HST 52 Mullard Space Science 52 neutrino 52 Attosecond 52 Biological Cybernetics 52 CCLRC Rutherford Appleton 52 quantum entanglement 52 Niels Bohr Institute 52 planet Gliese #g 52 observational cosmology 52 HiPER 52 KIPAC 52 Nanomechanical 52 Conductivity Analyzer 52 GLAST 52 Lamont Doherty 52 Planetary Geology 52 SuperWASP 52 extrasolar planetary 52 gravitationally lensed 52 Cosmic Microwave Background CMB 52 Interstellar Boundary Explorer 52 Neutron Detector 52 Advanced LIGO 52 axions 52 SINFONI 52 Antenna LISA 52 Fraunhofer IFF 52 spectrographs 52 Orbiter LRO 52 JCMT 52 Microprobe 52 Solar TErrestrial RElations Observatory 52 Jeffrey Hangst 52 Mississippi Potency Monitoring 52 Deep Impact Extended 52 microscopy technique 52 nanomechanics 52 Heterodyne Instrument 52 antiparticle 52 Alaska Fairbanks Geophysical 52 Bojowald 52 Diviner 52 Peru Geophysics 52 Arkani Hamed 52 HESS telescopes 52 numerical simulations 52 SETI Search 52 theoretical astrophysics 52 Avi Loeb 52 Terahertz 52 Australian Synchrotron 52 Phoenix Microscopy Electrochemistry 52 Supernova Cosmology Project 52 Rydberg atom 52 ultracold gases 52 SAXS 52 Cosmic Microwave Background 52 radial velocity 52 Carlos Frenk 52 Telescope Array 52 IBEX spacecraft 52 Hubble observations 52 Cloud Aerosol Lidar 52 Maria Zuber 52 detect gamma rays 52 Bioimaging 52 Raymond Jeanloz 52 proton antiproton collisions 52 GFZ German 52 geochemists 52 Centre Jülich 52 CERN Large Hadron 52 exoplanet atmospheres 52 VLBI 52 Ewan Birney 52 Sudbury Neutrino Observatory 52 Particle physics 52 Triangulum Galaxy 52 AMPERE 52 GRB #B 52 LIGO Scientific Collaboration 52 X ray absorption spectroscopy 52 neutral mass spectrometer 52 Atacama Large Millimeter submillimeter 52 Substorms mission 52 accelerator mass spectrometry 52 neutrino telescope 52 NASA Exobiology 52 ESA Herschel 52 blackbody 52 Jeffrey Kargel 52 Russell Hemley 52 EPOXI mission 52 NRAO 52 MARSIS radar 52 transcriptomics 52 Ames Laboratory 52 Southern Observatory ESO 52 Marvin Marshak 52 Solar Orbiter 52 AMASE 52 DISR 51 Wick Haxton 51 Jülich Research 51 Sara Seager 51 Lunar Exploration 51 multiwavelength 51 Jay Melosh 51 WIMPs 51 SPHERES 51 NSSTC 51 axion 51 Forschungszentrum Jülich 51 Microscopy Electrochemistry 51 Very Large Array 51 fluorescence spectroscopy 51 Sunyaev 51 Radio Astronomy MPIfR 51 optical biosensor 51 Trey Ideker 51 hyperspectral imager 51 iPlant 51 Ulysses spacecraft 51 XMM Newton 51 RRATs 51 Pan STARRS 51 Large Ion Collider 51 High Angular Resolution 51 Cassini Imaging 51 cosmic particles 51 ASKAP 51 absorption spectra 51 Proteomic 51 Planck 51 Thermal Emission Spectrometer 51 FT IR spectroscopy 51 superfluids 51 Rudolf Grimm 51 SAFOD 51 antiproton 51 supersolid 51 Exoplanet 51 Mary Voytek 51 interferometry 51 Adam Riess 51 IceCube telescope 51 Higgs boson particle 51 ESA Cluster 51 Extrasolar Planet Search 51 CIRS 51 Nasa Ames 51 correlator 51 Extrasolar Planets 51 Photometric 51 Jacques Laskar 51 Brookhaven Relativistic Heavy 51 synchrotron x ray 51 superstring theory 51 DEIMOS 51 GALEX 51 Rensselaer Nanotechnology 51 Rutherford Appleton 51 Michael Studinger 51 ion microscope 51 Particle Astrophysics 51 SN #A 51 LLNL 51 NOAO 51 Karl Menten 51 quantum particle 51 Inorganic Materials 51 neutron diffraction 51 Mini TES 51 Evolutionary Anthropology Leipzig 51 Corot 9b 51 electron diffraction 51 MPQ 51 Neutron scattering 51 Nasa Kepler 51 magnetic monopole 51 exo planets 51 Keck Telescope 51 UNAVCO 51 WHIM 51 optical wavelengths 51 Michael Zolensky 51 beamline #.#.# 51 Telescope BAT 51 Nanotechnology LCN 51 quantum chromodynamics QCD 51 Microlensing 51 FTIR spectroscopy 51 Max Plank 51 Array ALMA 51 Infrared Astronomy 51 Type Ia supernovae 51 ROSAT 51 Harlow Shapley 51 imaging spectrometer 51 gamma ray detector 51 microarray gene expression 51 infrared spectrograph 51 MIT Senseable City 51 Cherenkov 51 Extraterrestrial Intelligence 51 gravitons 51 Djorgovski 51 UCLA California NanoSystems 51 Planetary Physics 51 Gas Chromatograph Mass Spectrometer 51 Biocomputing 51 Paul Alivisatos 51 supersymmetry 51 Fraunhofer IPMS 51 particle physicists 51 Alfvén waves 51 NHMFL 51 asteroseismology 51 Astrobiology Institute 51 George Djorgovski 51 Spectrometry 51 APEX telescope 51 Arizona Steward Observatory 51 Interfacial Catalysis 51 RS Oph 51 sonofusion 51 Atmospheric Oceanic 51 NASA STEREO 51 Bose Einstein Condensate 51 noctilucent clouds 51 Awschalom 51 Huygens mission 51 photoemission 51 Micro Photonics 51 ATST 51 Grillmair 50 Relativistic 50 spectroscopic techniques 50 Quantum Optics MPQ 50 photometry 50 Dr Novoselov 50 NSLS II 50 Budker 50 Cold Dark Matter 50 Magnetospheric 50 Multiscale 50 infrared astronomy 50 Planck spacecraft 50 gradiometer 50 infrared spectrometers 50 DEPTHX 50 Einstein equations 50 Jonathan Lunine 50 Andrea Ghez 50 David Wettergreen 50 Laboratory RAL 50 neutron scattering 50 Hobby Eberly Telescope 50 Active Galactic Nuclei 50 ATLAS 50 LCROSS mission 50 PSR J# 50 Ionospheric 50 astrophysical 50 Optical Microscopy 50 PPARC 50 Max Planck Institut fuer 50 lunar meteorites 50 Tevatron experiments 50 Crab Pulsar 50 Submillimeter 50 neutron scattering experiments 50 magnetospheric 50 Michal Lipson 50 magnetic tweezers 50 Heavy Ion 50 Richard Binzel 50 Observatory LDEO 50 Henize #-# 50 X ray observatory 50 VIRTIS instrument 50 Konrad Gelbke 50 Villigen Switzerland 50 Extraterrestrial Intelligence Institute 50 T2K 50 Space Infrared Telescope 50 fermionic 50 Helmholtz Zentrum Berlin 50 Habitable Worlds 50 Dark Cosmology 50 Petascale Computing 50 HARPS instrument 50 absorbs photons 50 Rychard Bouwens 50 Dana Yoerger 50 #gy 50 SQUID 50 dipole moment 50 Integrated Nanomechanical Systems 50 HZB 50 LHC accelerator 50 Uzi Landman 50 stellar occultation 50 Geoscience Laser Altimeter 50 neutrino observatory 50 Albert Laszlo Barabasi 50 GRB# 50 Astroparticle Physics 50 Cees Dekker 50 Walter Arabasz 50 infrared telescopes 50 OSIRIS REx 50 ESA Planck 50 Cepheid variables 50 Bose Einstein condensates 50 Stadermann 50 e VLBI 50 Kavli Institute 50 Observatoire de Paris 50 pseudogap 50 Cosmic Background Explorer COBE 50 Kashlinsky 50 antihelium 50 Laser Interferometer Space 50 Spacewatch 50 Synchrotron 50 exobiology 50 gravitational redshift 50 Pierre Auger Observatory 50 Jim Kasting 50 pentaquark 50 NINT 50 Cometary 50 Ocean Salinity SMOS 50 microshutters 50 spaceborne 50 magnetic monopoles 50 Uwe Bergmann 50 Infrared Pathfinder Satellite 50 Area Telescope LAT 50 absorption spectroscopy 50 neutron activation analysis 50 YES2 50 SIRTF 50 metagenomic 50 OGLE 50 CoRoT satellite 50 WMAP 50 Kepler spacecraft 50 Bose Einstein 50 Descent Imager Spectral Radiometer 50 powder diffraction 50 HD#b 50 Neutral Mass Spectrometer 50 RPWS 50 Maryland NanoCenter 50 Dendrochronology 50 Virtual Planetary Laboratory 50 Fourier transform 50 Stanford Synchrotron Radiation 50 BioServe Space Technologies 50 MIT Haystack Observatory 50 Physics Letters 50 Quantum Optics 50 TanDEM X 50 Observatory LIGO 50 National Superconducting Cyclotron 50 Single Molecule 50 Mass Spectrometer 50 Steward Observatory Mirror 50 subatomic 50 Volatile Evolution 50 NMR spectroscopy 50 Peter Grünberg 50 HPCGG 50 Meteoritics 50 John Grotzinger 50 Tokamak 50 Instrument OMI 50 submillimeter wavelengths 50 Nanophase Materials Sciences 50 cryo electron microscope 50 Cassini magnetometer instrument 50 Long Wavelength Array 50 Cosmological 50 Deep Impact eXtended Investigation 50 Photoacoustic 50 HRTEM 50 mesosphere 50 optical lattices 50 ESO Very Large Telescope 50 photoacoustic 50 EMBL 50 UA Steward Observatory 50 eclipsing binary 50 paleoclimatology 50 Colloidal Emulsions 50 HFIR 50 WM Keck 50 Pierre Simon Laplace 50 ultraviolet spectrometer 50 Accelerator Mass Spectrometry 50 Integrated Nanotechnologies 50 Oganessian 50 interferometric observations 50 Bernard Foing 50 neutralino 50 Min Gu 50 Fourier transform infrared 50 PPPL 50 NASA Cassini 50 ESO PR 50 Nondestructive Evaluation 50 conclusions NASA Astrobiology 50 multiphoton 50 Pierre Auger 50 physicists 50 Protein Crystallography 50 Gamma ray burst 50 Imaging Spectrometer 50 Saturnian system 50 Fermi Telescope 49 Raman spectrometer 49 spectroscopic measurements 49 gamma ray telescopes 49 SIRAL 49 Higgs particle 49 LTER 49 Biomolecular 49 Hao Yan 49 UVIS 49 SEMATECH FEP 49 entangled quantum 49 ICECAP 49 X ray pulses 49 electro optic modulator 49 JILA joint 49 ChIP Seq 49 Chajnantor 49 FRIB 49 quantum gravity 49 MEarth 49 Synthetic Aperture Radar 49 Kazantzidis 49 CRISM 49 Don Gurnett 49 Bayesian inference 49 cosmological distances 49 Nicholas Kotov 49 MAVEN 49 x ray pulses 49 Mid Infrared 49 Wolfgang Brandner 49 Fundamental Physics 49 Jean Luc Margot 49 optical coherence 49 observational astronomy 49 Hagan Bayley 49 Risø 49 GLAST Burst Monitor 49 Solar Observatory 49 kaons 49 SciDAC 49 Mini Thermal Emission 49 JQI 49 quantum teleportation 49 microbial genome sequencing 49 Relativistic Heavy Ion Collider 49 Cassini ion 49 Biomedical Magnetic Resonance 49 electron accelerator 49 CCCEH 49 GLBRC 49 High Flux Isotope 49 PharmaSat 49 Telecommunications Heinrich Hertz 49 Synthetic Aperture Radar SAR 49 ExoMars 49 CU Boulder LASP 49 Christopher Chyba 49 Extraterrestrial Life 49 x ray scattering 49 Proteomics Facility 49 orbiting Chandra 49 Transmission Electron Microscope 49 Mossbauer 49 multiscale 49 Margarita Marinova 49 High Resolution Imaging 49 Alex Zettl 49 Global Precipitation Climatology 49 Ice Coring 49 hadrons 49 Helmholtz Zentrum München 49 frequency combs 49 Radiochemistry 49 beamlines 49 GIOVE B 49 Functional Nanomaterials 49 topological insulators 49 Keck telescope 49 Fomalhaut b 49 Freie Universitaet Berlin 49 NASA Orbiting Carbon 49 scanning optical microscopy 49 ATRAP 49 Hipparcos 49 ESA Envisat satellite 49 scanning tunneling microscopy 49 Purdue Birck Nanotechnology 49 WM Keck Observatory 49 Peer Bork 49 Ultracold Atoms 49 Max Delbrück Center 49 Bose Einstein condensation 49 Virgo Cluster 49 John Zarnecki 49 Gerard Kuiper 49 Ecole Polytechnique Fédérale de 49 Saul Perlmutter 49 TRIUMF 49 quantum optics 49 laser altimeter 49 Lunar Reconnaissance Orbiter LRO 49 Experimental Physics 49 GRAIL 49 Svante Pääbo 49 National Astronomical Observatory 49 Epoxi 49 Neanderthal Genome Project 49 Giovanni Picardi 49 NSF TeraGrid 49 N. Rathnasree 49 surface plasmon resonance 49 Aberdeen Oceanlab 49 Gemini Observatory 49 LSST 49 UA Lunar 49 superlens 49 extrasolar planet 49 God Particle 49 Applied Physics Lab 49 Bruce Jakosky 49 photon counting 49 Earthlike planets 49 Harold Craighead 49 Astrophysics 49 Neuroengineering 49 NCEM 49 CHARA 49 IODP 49 Ion Trap 49 gas chromatograph mass spectrometer 49 nanoprobe 49 Louis Stodieck 49 paleomagnetic 49 subatomic particle 49 Cancri e 49 Rayleigh scattering 49 terahertz THz 49 NSCL 49 HARPS 49 vanadium dioxide 49 correlative microscopy 49 Comet Hartley 49 RS Ophiuchi 49 microprobe 49 Nasa Goddard Space 49 CIRES 49 extragalactic 49 GLAST telescope 49 Infrared Thermal Imaging Spectrometer 49 ultracold 49 Wilkinson Microwave Probe 49 lattice QCD 49 interplanetary spacecraft 49 Particle Accelerator 49 GJ #b [001] 49 Nankai Trough Zone 49 Shallow Radar 49 STFC Rutherford Appleton 49 backscattering 49 Planck telescope 49 Terrestrial Magnetism 49 Exoplanets 49 Collider LHC 49 NASA Stratospheric Observatory 49 gravitational lenses 49 ultrashort laser pulses 49 mass spectrometric 49 GeV 49 particle smasher 49 Observatory STEREO 49 XMM Newton satellite 49 IceCube Neutrino Observatory 49 constellation Carina 49 spectroscope 49 Soft Matter 49 Magnetic Imager HMI 49 astrophysical objects 49 Magnetic Imager 49 planetary astronomy 49 nucleosynthesis 49 NCNR 49 QGP 49 Robotic Exploration 49 Project Ozma 49 Ocean Salinity 49 Nikhil Koratkar 49 Schawinski 49 Nasa Jet Propulsion 49 Earth ionosphere 49 Infrared Array Camera 49 Heliophysics 49 SECCHI 49 ADM Aeolus 49 exosolar planets 49 scintillator 49 HiRISE 49 graphene flake 49 International Linear Collider 49 Jennifer Heldmann 49 distant quasar 49 Force Microscopy 49 Geophysical Laboratory 49 THz 49 TerraSAR X 49 smallest exoplanet 49 LISA Pathfinder 49 Lunar Reconnaissance Orbiter Camera 49 magnetic reconnection 49 EMBL scientists 49 Jenniskens 49 Milky Way halo 49 high temperature superconductivity 49 redshift 49 Mott insulator 48 Carl Woese 48 attosecond 48 NASA Kepler spacecraft 48 Spitzer infrared spectrograph 48 HUDF 48 BBSRC funded 48 Beckman Laser 48 quantum tunneling 48 Oscillations 48 airglow 48 Electron Microscopy NCEM 48 Aristeidis Karalis 48 mineralogical composition 48 ultracold polar molecules 48 large hadron collider 48 diffraction pattern 48 gamma ray detectors 48 neutron detector 48 Solar Terrestrial Relations 48 Scripps Oceanography 48 optical spectroscopy 48 Wilkinson Microwave Anisotropy Probe 48 submillimeter 48 Alpha Particle 48 particle acceleration 48 UC Observatories Lick 48 Alberto Behar 48 Alfred McEwen 48 Max Tegmark 48 synchrotron radiation