| active galactic nucleus | AGN | 3902 | 280 | 1.742323 | 9901108,9901023,etc |
| cosmic microwave background | CMB | 4042 | 223 | 1.676051 | 9901018,9901001,etc |
| spectral energy distribution | SED | 2065 | 193 | 1.406361 | 9901123,9901106,etc |
| point spread function | PSF | 2015 | 192 | 1.861596 | 9901018,9901059,etc |
| interstellar medium | ISM | 2008 | 188 | 1.464592 | 9901422,9901059,etc |
| nasa/ipac extragalactic database | NED | 281 | 172 | 1.000239 | 9901023,9901394,etc |
| cold dark matter | CDM | 2437 | 166 | 1.575242 | 9901240,9901114,etc |
| initial mass function | IMF | 2017 | 159 | 1.404993 | 9901298,9901237,etc |
| star formation rate | SFR | 1895 | 155 | 1.563887 | 9901298,9901306,etc |
| gamma ray burst | GRB | 4652 | 131 | 1.762344 | 9901324,9901338,etc |
| hubble space telescope | HST | 1082 | 119 | 1.505453 | 9901081,9901022,etc |
| very large array | VLA | 861 | 104 | 1.462949 | 9901387,9901389,etc |
| supernova remnant | SNR | 2290 | 101 | 1.856296 | 9901347,9901061,etc |
| asymptotic giant branch | AGB | 1920 | 94 | 1.929109 | 9901126,9901328,etc |
| luminosity function | LF | 2175 | 91 | 1.421376 | 9901355,9901095,etc |
| color magnitude diagram | CMD | 1569 | 90 | 1.313103 | 9901251,9901067,etc |
| supernova | SN | 5459 | 87 | 2.009638 | 9901347,9901011,etc |
| red giant branch | RGB | 1709 | 82 | 1.880728 | 9901067,9901074,etc |
| large magellanic cloud | LMC | 1744 | 76 | 1.845495 | 9901043,9901282,etc |
| equivalent width | EW | 821 | 69 | 1.58143 | 9901348,9901142,etc |
| proportional counter array | PCA | 593 | 66 | 1.68305 | 9901125,9901161,etc |
| low mass x ray binary | LMXB | 477 | 62 | 1.469226 | 9901023,9901327,etc |
| intergalactic medium | IGM | 866 | 61 | 1.592233 | 9901114,9901100,etc |
| horizontal branch | HB | 2415 | 61 | 1.530841 | 9901245,9901067,etc |
| hubble deep field | HDF | 561 | 57 | 1.528786 | 9901272,9901210,etc |
| far infrared | far-IR | 995 | 54 | 1.632523 | 9901059,9901325,etc |
| main sequence | MS | 742 | 53 | 1.680664 | 9901245,9901074,etc |
| intracluster medium | ICM | 978 | 52 | 1.560224 | 9901018,9901061,etc |
| broad line region | BLR | 865 | 52 | 1.444213 | 9901023,9901106,etc |
| full width at half maximum | FWHM | 300 | 52 | 1.077611 | 9902253,9902254,etc |
| infrared | IR | 1055 | 51 | 1.904982 | 9901042,9901248,etc |
| all sky monitor | ASM | 423 | 51 | 1.433177 | 9901125,9901404,etc |
| near infrared | NIR | 698 | 50 | 1.541687 | 9901419,9901218,etc |
| rossi x ray timing explorer | RXTE | 488 | 48 | 1.710457 | 9901125,9901084,etc |
| equation of state | EOS | 711 | 44 | 1.457044 | 9901118,9901167,etc |
| ultraviolet | UV | 1349 | 44 | 1.843208 | 9901170,9901208,etc |
| signal to noise ratio | SNR | 238 | 43 | 1.419137 | 9901063,9901269,etc |
| planetary nebula | PN | 1562 | 43 | 1.913162 | 9903410,9903419,etc |
| dark matter | DM | 1209 | 41 | 2.002689 | 9901240,9901400,etc |
| inverse compton | IC | 744 | 41 | 1.783208 | 9901018,9901061,etc |
| ultraluminous infrared galaxy | ULIG | 1049 | 41 | 1.638572 | 9903214,9903152,etc |
| high resolution imager | HRI | 554 | 40 | 1.601377 | 9901348,9901132,etc |
| quasi periodic oscillation | QPO | 1460 | 39 | 1.956178 | 9901161,9901349,etc |
| sloan digital sky survey | SDSS | 579 | 39 | 1.617262 | 9901422,9901113,etc |
| rosat all sky survey | RASS | 417 | 39 | 1.489359 | 9902067,9902277,etc |
| infrared space observatory | ISO | 562 | 38 | 1.739765 | 9901267,9901126,etc |
| position sensitive proportional counter | PSPC | 457 | 37 | 1.758111 | 9901137,9901304,etc |
| black hole | BH | 903 | 37 | 1.327468 | 9901023,9901011,etc |
| kolmogorov smirnov | KS | 137 | 37 | 1.081577 | 9901341,9901214,etc |
| cataclysmic variable | CV | 517 | 36 | 1.836664 | 9901295,9901397,etc |
| small magellanic cloud | SMC | 401 | 34 | 1.472148 | 9901043,9901282,etc |
| big bang nucleosynthesis | BBN | 321 | 34 | 1.884456 | 9901157,9901109,etc |
| field of view | FOV | 204 | 34 | 1.442176 | 9901413,9901222,etc |
| signal to noise | S/N | 186 | 34 | 1.265085 | 9901263,9901101,etc |
| white dwarf | WD | 1017 | 34 | 1.474431 | 9901080,9901027,etc |
| wolf rayet | WR | 1172 | 34 | 2.004289 | 9901269,9901170,etc |
| synchrotron self compton | SSC | 335 | 33 | 1.395584 | 9901324,9901106,etc |
| james clerk maxwell telescope | JCMT | 103 | 33 | 1.182138 | 9901394,9901106,etc |
| advection dominated accretion flow | ADAF | 519 | 33 | 1.669734 | 9901108,9901023,etc |
| narrow line region | NLR | 446 | 33 | 1.54782 | 9901023,9901348,etc |
| cosmic microwave background radiation | CBR | 431 | 33 | 1.850399 | 9901168,9901030,etc |
| neutron star | NS | 909 | 32 | 1.784915 | 9901413,9901075,etc |
| position angle | PA | 359 | 32 | 1.282595 | 9901361,9901190,etc |
| young stellar object | YSO | 302 | 32 | 1.782675 | 9901019,9901029,etc |
| australia telescope compact array | ATCA | 145 | 31 | 1.000921 | 9903448,9903016,etc |
| smoothed particle hydrodynamics | SPH | 529 | 30 | 1.66919 | 9901017,9901143,etc |
| burst and transient source experiment | BATSE | 397 | 30 | 1.636051 | 9902054,9902190,etc |
| tully fisher | TF | 922 | 30 | 1.836042 | 9903380,9903005,etc |
| space telescope imaging spectrograph | STIS | 393 | 28 | 1.716731 | 9901320,9901280,etc |
| zero age main sequence | ZAMS | 145 | 28 | 1.143829 | 9901251,9901140,etc |
| probability distribution function | PDF | 427 | 27 | 1.781435 | 9901400,9901340,etc |
| globular cluster | GC | 1485 | 27 | 2.006192 | 9902086,9902164,etc |
| wide field planetary camera 2 | WFPC2 | 313 | 27 | 1.519191 | 9903065,9903245,etc |
| compton gamma ray observatory | CGRO | 79 | 26 | 1.231569 | 9901404,9901222,etc |
| fundamental plane | FP | 430 | 26 | 1.503574 | 9901001,9901242,etc |
| x ray background | XRB | 385 | 26 | 1.617833 | 9901103,9901121,etc |
| gamma ray bursts | GRB | 562 | 26 | 1.50465 | 9902013,9902039,etc |
| fast fourier transform | FFT | 89 | 25 | 1.200272 | 9901143,9901131,etc |
| broad absorption line | BAL | 973 | 25 | 1.445935 | 9902371,9902081,etc |
| very long baseline interferometry | VLBI | 356 | 24 | 1.627533 | 9901396,9901204,etc |
| low surface brightness | LSB | 456 | 23 | 1.785533 | 9902249,9902171,etc |
| polycyclic aromatic hydrocarbon | PAH | 422 | 23 | 1.567592 | 9902077,9902116,etc |
| wide field and planetary camera 2 | WFPC2 | 168 | 23 | 1.522585 | 9903018,9903053,etc |
| cosmic ray | CR | 531 | 22 | 1.913424 | 9901033,9901199,etc |
| wide field camera | WFC | 172 | 22 | 1.274016 | 9901299,9901031,etc |
| digitized sky survey | DSS | 66 | 22 | 1.136662 | 9901227,9901202,etc |
| star formation | SF | 534 | 22 | 1.547753 | 9904134,9904081,etc |
| giant molecular cloud | GMC | 380 | 21 | 1.620899 | 9901394,9901370,etc |
| particle mesh | PM | 449 | 21 | 1.668524 | 9901191,9901064,etc |
| standard cold dark matter | sCDM | 144 | 21 | 1.238744 | 9901143,9901099,etc |
| local thermodynamic equilibrium | LTE | 347 | 21 | 1.38431 | 9901288,9901294,etc |
| canada france hawaii telescope | CFHT | 105 | 21 | 1.191011 | 9902249,9902159,etc |
| william herschel telescope | WHT | 141 | 21 | 1.095905 | 9903217,9903410,etc |
| las campanas redshift survey | LCRS | 252 | 20 | 1.651977 | 9901378,9901420,etc |
| very high energy | VHE | 360 | 20 | 1.702018 | 9901365,9901215,etc |
| pre main sequence | PMS | 253 | 20 | 1.701307 | 9902114,9902318,etc |
| sunyaev zel'dovich | SZ | 470 | 20 | 1.603504 | 9903379,9903166,etc |
| proportional counter unit | PCU | 75 | 20 | 1.000367 | 9903276,9903360,etc |
| magnetohydrodynamic | MHD | 304 | 19 | 1.896894 | 9901166,9901309,etc |
| two dimensional | 2D | 132 | 19 | 1.579857 | 9901108,9901279,etc |
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