| active galactic nucleus | AGN | 446 | 23 | 2.003403 | 9811011,9811082,etc |
| cosmic microwave background | CMB | 348 | 22 | 1.003287 | 9811364,9811395,etc |
| interstellar medium | ISM | 180 | 16 | 2.003183 | 9811409,9811428,etc |
| cold dark matter | CDM | 84 | 13 | 2.001062 | 9811364,9811011,etc |
| luminosity function | LF | 308 | 12 | 2.004537 | 9811395,9811409,etc |
| nasa/ipac extragalactic database | NED | 19 | 11 | 1.000075 | 9811332,9811239,etc |
| hubble space telescope | HST | 72 | 11 | 2.001817 | 9811255,9811088,etc |
| equivalent width | EW | 127 | 10 | 2.002304 | 9811002,9811372,etc |
| star formation rate | SFR | 217 | 9 | 1.002056 | 9811202,9811126,etc |
| spectral energy distribution | SED | 47 | 9 | 1.000666 | 9811162,9811126,etc |
| point spread function | PSF | 54 | 9 | 1.000452 | 9811005,9811071,etc |
| asymptotic giant branch | AGB | 45 | 9 | 1.00201 | 9811382,9811178,etc |
| hubble deep field | HDF | 144 | 8 | 2.006805 | 9811202,9811395,etc |
| red giant branch | RGB | 58 | 8 | 2.00212 | 9811382,9811321,etc |
| low surface brightness | LSB | 264 | 8 | 1.00522 | 9811095,9811047,etc |
| equation of state | EOS | 92 | 8 | 2.001222 | 9811463,9811179,etc |
| initial mass function | IMF | 143 | 8 | 2.001171 | 9811387,9811258,etc |
| very large array | VLA | 34 | 7 | 1.000653 | 9811098,9811318,etc |
| x ray background | XRB | 59 | 7 | 2.002265 | 9811002,9811395,etc |
| high velocity cloud | HVC | 147 | 7 | 2.005227 | 9811255,9811283,etc |
| horizontal branch | HB | 212 | 6 | 2.012487 | 9811175,9811321,etc |
| big bang nucleosynthesis | BBN | 39 | 6 | 1.001847 | 9811364,9811466,etc |
| color magnitude diagram | CMD | 129 | 6 | 1.004698 | 9811445,9811479,etc |
| supernova remnant | SNR | 87 | 6 | 2.001493 | 9811011,9811247,etc |
| supernova | SN | 169 | 6 | 1.002969 | 9811071,9811466,etc |
| interstellar radiation field | ISRF | 60 | 6 | 2.001019 | 9811033,9811221,etc |
| quasi periodic oscillation | QPO | 124 | 5 | 1.006378 | 9811404,9811023,etc |
| low mass x ray binary | LMXB | 93 | 5 | 1.008595 | 9811404,9811063,etc |
| infrared space observatory | ISO | 82 | 5 | 2.001396 | 9811202,9811355,etc |
| canada france redshift survey | CFRS | 94 | 5 | 1.002351 | 9811202,9811201,etc |
| intracluster medium | ICM | 80 | 5 | 2.006049 | 9811409,9811005,etc |
| kolmogorov smirnov | K-S | 18 | 5 | 1.00038 | 9811178,9811469,etc |
| far infrared | FIR | 60 | 5 | 2.000811 | 9811017,9811389,etc |
| rosat all sky survey | RASS | 33 | 5 | 2.00137 | 9811093,9811139,etc |
| black hole | BH | 240 | 5 | 2.007261 | 9811071,9811180,etc |
| cosmic ray | CR | 59 | 5 | 1.001396 | 9811389,9811225,etc |
| full width at half maximum | FWHM | 19 | 5 | 1.001381 | 9811459,9811171,etc |
| australia telescope compact array | ATCA | 23 | 5 | 2.001305 | 9811253,9811309,etc |
| main sequence | MS | 69 | 5 | 2.000981 | 9811138,9811122,etc |
| high surface brightness | HSB | 111 | 5 | 2.001427 | 9811033,9811450,etc |
| canada france hawaii telescope | CFHT | 11 | 4 | 1.001281 | 9811202,9811034,etc |
| fundamental plane | FP | 92 | 4 | 2.001766 | 9811089,9811416,etc |
| intergalactic medium | IGM | 41 | 4 | 1.001234 | 9811395,9811045,etc |
| galactic center | GC | 69 | 4 | 2.001559 | 9811011,9811317,etc |
| inverse compton | IC | 40 | 4 | 2.002268 | 9811162,9811389,etc |
| cosmic microwave background radiation | CBR | 38 | 4 | 1.001017 | 9811366,9811460,etc |
| white dwarf | WD | 95 | 4 | 2.002961 | 9811178,9811071,etc |
| neutron star | NS | 54 | 4 | 2.003824 | 9811071,9811247,etc |
| high energy astrophysics science archive research center | HEASARC | 13 | 4 | 1.000253 | 9811071,9811080,etc |
| narrow line region | NLR | 62 | 4 | 2.002955 | 9811459,9811088,etc |
| broad line region | BLR | 61 | 4 | 1.002121 | 9811459,9811088,etc |
| rossi x ray timing explorer | RXTE | 18 | 4 | 1.001761 | 9811455,9811443,etc |
| nordic optical telescope | NOT | 15 | 4 | 1.000565 | 9811455,9811413,etc |
| astronomy | ASTRON | 3 | 3 | 1.000048 | 9811404,9811261,etc |
| unidentified infrared band | UIB | 4 | 3 | 1.00052 | 9811202,9811201,etc |
| james clerk maxwell telescope | JCMT | 6 | 3 | 1.000156 | 9811098,9811249,etc |
| globular cluster | GC | 50 | 3 | 2.000441 | 9811175,9811173,etc |
| sloan digital sky survey | SDSS | 6 | 3 | 1.000111 | 9811364,9811227,etc |
| broad emission line region | BLR | 28 | 3 | 2.002129 | 9811278,9811481,etc |
| compton gamma ray observatory | CGRO | 17 | 3 | 2.000636 | 9811011,9811219,etc |
| small magellanic cloud | SMC | 119 | 3 | 2.008095 | 9811011,9811394,etc |
| william herschel telescope | WHT | 6 | 3 | 1.00031 | 9811255,9811413,etc |
| goddard high resolution spectrograph | GHRS | 17 | 3 | 2.000582 | 9811255,9811253,etc |
| pre main sequence | PMS | 22 | 3 | 2.000628 | 9811289,9811210,etc |
| near infrared | NIR | 31 | 3 | 2.001401 | 9811105,9811034,etc |
| standard cold dark matter | SCDM | 10 | 3 | 1.000795 | 9811393,9811362,etc |
| large magellanic cloud | LMC | 55 | 3 | 1.003436 | 9811394,9811389,etc |
| signal to noise | S/N | 21 | 3 | 2.000113 | 9811005,9811138,etc |
| turn off | TO | 60 | 3 | 2.002918 | 9811382,9811329,etc |
| full width half maximum | FWHM | 31 | 3 | 2.001544 | 9811071,9811087,etc |
| high resolution imager | HRI | 152 | 3 | 2.001668 | 9811071,9811377,etc |
| power law | POWL | 24 | 3 | 1.002094 | 9811071,9811063,etc |
| gamma ray bursts | GRB | 49 | 3 | 2.007501 | 9811007,9811232,etc |
| very long baseline array | VLBA | 21 | 3 | 1.001237 | 9811318,9811375,etc |
| gamma ray burst | GRB | 73 | 3 | 2.006197 | 9811026,9811367,etc |
| burst and transient source experiment | BATSE | 64 | 3 | 2.001898 | 9811455,9811367,etc |
| three dimensional | 3D | 9 | 3 | 1.000094 | 9811057,9811259,etc |
| distribution function | DF | 8 | 3 | 1.001962 | 9811180,9811403,etc |
| broad line radio galaxies | BLRG | 24 | 3 | 2.000761 | 9811468,9811203,etc |
| narrow line radio galaxies | NLRG | 14 | 3 | 1.000399 | 9811468,9811203,etc |
| cataclysmic variable | CV | 242 | 3 | 2.007394 | 9811138,9811339,etc |
| cosmic lens all sky survey | CLASS | 55 | 3 | 2.001557 | 9811167,9811425,etc |
| red clump | RC | 34 | 3 | 1.001163 | 9811479,9811122,etc |
| proportional counter array | PCA | 21 | 3 | 2.000534 | 9811261,9811236,etc |
| intra cluster medium | ICM | 5 | 3 | 1.000071 | 9811080,9811045,etc |
| westerbork synthesis radio telescope | WSRT | 8 | 3 | 1.000362 | 9811425,9811128,etc |
| medium deep survey | MDS | 30 | 3 | 1.000524 | 9811465,9811292,etc |
| dwarf spheroidal | dSph | 44 | 3 | 2.002201 | 9811122,9811127,etc |