| active galactic nucleus | AGN | 362 | 27 | 2.003385 | 9901108,9901023,etc |
| cosmic microwave background | CMB | 274 | 16 | 2.004347 | 9901018,9901001,etc |
| cold dark matter | CDM | 159 | 14 | 2.001263 | 9901240,9901114,etc |
| nasa/ipac extragalactic database | NED | 41 | 14 | 1.000265 | 9901023,9901394,etc |
| interstellar medium | ISM | 122 | 14 | 2.001237 | 9901422,9901059,etc |
| point spread function | PSF | 116 | 12 | 1.001216 | 9901018,9901059,etc |
| spectral energy distribution | SED | 110 | 10 | 2.002179 | 9901123,9901106,etc |
| quasi periodic oscillation | QPO | 240 | 9 | 2.0064 | 9901161,9901349,etc |
| cataclysmic variable | CV | 155 | 7 | 2.008189 | 9901295,9901397,etc |
| gamma ray burst | GRB | 128 | 7 | 1.003744 | 9901324,9901338,etc |
| synchrotron self compton | SSC | 81 | 7 | 1.002195 | 9901324,9901106,etc |
| intracluster medium | ICM | 322 | 7 | 1.007408 | 9901018,9901061,etc |
| low mass x ray binary | LMXB | 64 | 7 | 1.001348 | 9901023,9901327,etc |
| intergalactic medium | IGM | 76 | 7 | 2.000933 | 9901114,9901100,etc |
| supernova remnant | SNR | 368 | 7 | 2.007314 | 9901347,9901061,etc |
| dark matter | DM | 287 | 6 | 2.001086 | 9901240,9901400,etc |
| proportional counter array | PCA | 60 | 6 | 2.002106 | 9901125,9901161,etc |
| rossi x ray timing explorer | RXTE | 84 | 6 | 2.002201 | 9901125,9901084,etc |
| james clerk maxwell telescope | JCMT | 21 | 6 | 1.000371 | 9901394,9901106,etc |
| initial mass function | IMF | 58 | 6 | 1.002282 | 9901298,9901237,etc |
| magnetohydrodynamic | MHD | 115 | 6 | 2.003357 | 9901166,9901309,etc |
| infrared | IR | 87 | 6 | 2.001116 | 9901042,9901248,etc |
| compton gamma ray observatory | CGRO | 21 | 6 | 2.001714 | 9901404,9901222,etc |
| high resolution imager | HRI | 90 | 6 | 1.001446 | 9901348,9901132,etc |
| equivalent width | EW | 56 | 6 | 2.002421 | 9901348,9901142,etc |
| probability distribution function | PDF | 78 | 6 | 1.003569 | 9901400,9901340,etc |
| advection dominated accretion flow | ADAF | 81 | 5 | 2.004607 | 9901108,9901023,etc |
| all sky monitor | ASM | 24 | 5 | 1.002492 | 9901125,9901404,etc |
| broad line region | BLR | 23 | 5 | 1.000511 | 9901023,9901106,etc |
| equation of state | EOS | 95 | 5 | 1.004427 | 9901118,9901167,etc |
| hubble deep field | HDF | 29 | 5 | 1.002177 | 9901272,9901210,etc |
| position sensitive proportional counter | PSPC | 65 | 5 | 2.000997 | 9901137,9901304,etc |
| very large array | VLA | 104 | 5 | 2.002905 | 9901387,9901389,etc |
| star formation rate | SFR | 99 | 5 | 2.003359 | 9901298,9901306,etc |
| large scale structure | LSS | 42 | 5 | 1.001432 | 9901191,9901303,etc |
| primordial black hole | PBH | 278 | 5 | 2.006627 | 9901286,9901293,etc |
| small magellanic cloud | SMC | 113 | 5 | 2.002478 | 9901043,9901282,etc |
| luminosity function | LF | 68 | 5 | 1.004864 | 9901355,9901095,etc |
| color magnitude diagram | CMD | 43 | 5 | 1.000946 | 9901251,9901067,etc |
| hubble space telescope | HST | 32 | 5 | 2.00107 | 9901081,9901022,etc |
| two dimensional | 2D | 34 | 4 | 2.001552 | 9901108,9901279,etc |
| intermediate polar | IP | 77 | 4 | 2.002799 | 9901295,9901146,etc |
| high velocity cloud | HVC | 128 | 4 | 2.006866 | 9901240,9901307,etc |
| black hole | BH | 101 | 4 | 1.002066 | 9901023,9901011,etc |
| narrow line region | NLR | 96 | 4 | 2.003619 | 9901023,9901348,etc |
| local group | LG | 49 | 4 | 1.003528 | 9901001,9901245,etc |
| big bang nucleosynthesis | BBN | 66 | 4 | 2.002917 | 9901157,9901109,etc |
| sloan digital sky survey | SDSS | 17 | 4 | 2.00024 | 9901422,9901113,etc |
| cosmic background radiation | CBR | 56 | 4 | 2.002321 | 9901109,9901066,etc |
| friedmann robertson walker | FRW | 26 | 4 | 2.001441 | 9901040,9901212,etc |
| energetic gamma ray experiment telescope | EGRET | 96 | 4 | 2.002658 | 9901106,9901222,etc |
| smoothed particle hydrodynamics | SPH | 20 | 4 | 1.0014 | 9901017,9901143,etc |
| neutron star | NS | 33 | 4 | 2.001706 | 9901413,9901075,etc |
| field of view | FOV | 13 | 4 | 1.000412 | 9901413,9901222,etc |
| space telescope imaging spectrograph | STIS | 33 | 4 | 2.001433 | 9901320,9901280,etc |
| signal to noise | S/N | 14 | 4 | 1.000182 | 9901263,9901101,etc |
| position angle | PA | 37 | 4 | 2.000649 | 9901361,9901190,etc |
| power density spectra | PDS | 11 | 4 | 1.000582 | 9901050,9901162,etc |
| milky way | MW | 21 | 3 | 1.000416 | 9901240,9901409,etc |
| high mass x ray binary | HMXB | 8 | 3 | 1.000093 | 9901125,9901084,etc |
| inverse compton | IC | 137 | 3 | 1.003085 | 9901018,9901061,etc |
| soft x ray transient | SXT | 15 | 3 | 1.0009 | 9901296,9901075,etc |
| point source catalog | PSC | 19 | 3 | 2.000991 | 9901419,9901126,etc |
| near infrared | NIR | 46 | 3 | 2.003925 | 9901419,9901218,etc |
| young stellar object | YSO | 6 | 3 | 1.000127 | 9901019,9901029,etc |
| supernova | SN | 144 | 3 | 2.007371 | 9901347,9901011,etc |
| colour magnitude diagram | CMD | 103 | 3 | 2.001158 | 9901245,9901252,etc |
| horizontal branch | HB | 23 | 3 | 2.000371 | 9901245,9901067,etc |
| main sequence | MS | 21 | 3 | 1.000914 | 9901245,9901074,etc |
| supermassive black hole | SMBH | 31 | 3 | 2.001329 | 9901374,9901008,etc |
| very long baseline array | VLBA | 69 | 3 | 2.002458 | 9901374,9901204,etc |
| kelvin helmholtz | KH | 53 | 3 | 2.002223 | 9901166,9901379,etc |
| versatile advection code | VAC | 27 | 3 | 2.000959 | 9901166,9901380,etc |
| new technology telescope | NTT | 12 | 3 | 1.000858 | 9901248,9901263,etc |
| wide field cameras | WFC | 22 | 3 | 2.001527 | 9901413,9901233,etc |
| very long baseline interferometry | VLBI | 39 | 3 | 1.002128 | 9901396,9901204,etc |
| photon dominated region | PDR | 31 | 3 | 2.000387 | 9901134,9901133,etc |
| photomultiplier | PMT | 57 | 3 | 2.003994 | 9901199,9901160,etc |
| high magnification event | HME | 100 | 3 | 2.003732 | 9901341,9901336,etc |
| kolmogorov smirnov | KS | 25 | 3 | 2.001362 | 9901341,9901214,etc |
| white dwarf | WD | 65 | 3 | 2.005637 | 9901080,9901027,etc |
| brightest cluster galaxy | BCG | 72 | 3 | 2.006923 | 9901062,9901283,etc |
| zero age main sequence | ZAMS | 13 | 3 | 1.000406 | 9901251,9901140,etc |
| magnetohydrodynamics | MHD | 29 | 3 | 2.000566 | 9901081,9901083,etc |
| line of sight | LOS | 108 | 3 | 2.002496 | 9901197,9901060,etc |
| asymptotic giant branch | AGB | 10 | 3 | 1.000687 | 9901126,9901328,etc |
| lyon meudon extragalactic database | LEDA | 33 | 3 | 1.002107 | 9901412,9901214,etc |