| active galactic nucleus | AGN | 3078 | 247 | 1.791872 | 9801313,9801226,etc |
| cosmic microwave background | CMB | 3245 | 193 | 1.604639 | 9801121,9801291,etc |
| cold dark matter | CDM | 2447 | 153 | 1.636688 | 9801284,9801320,etc |
| interstellar medium | ISM | 1761 | 151 | 1.56503 | 9801131,9801181,etc |
| spectral energy distribution | SED | 1328 | 144 | 1.293293 | 9801288,9801062,etc |
| initial mass function | IMF | 1552 | 139 | 1.239861 | 9801321,9801131,etc |
| nasa/ipac extragalactic database | NED | 252 | 129 | 1.000233 | 9801063,9801137,etc |
| point spread function | PSF | 1042 | 128 | 1.587147 | 9801100,9801086,etc |
| star formation rate | SFR | 1602 | 126 | 1.406784 | 9801279,9801320,etc |
| hubble space telescope | HST | 1026 | 116 | 1.311659 | 9801321,9801190,etc |
| luminosity function | LF | 1865 | 99 | 1.548327 | 9801016,9801227,etc |
| gamma ray burst | GRB | 3822 | 89 | 2.007588 | 9801182,9801320,etc |
| large magellanic cloud | LMC | 1072 | 77 | 1.677544 | 9801321,9801051,etc |
| hubble deep field | HDF | 1220 | 75 | 1.323085 | 9801057,9801296,etc |
| supernova remnant | SNR | 1307 | 65 | 1.834093 | 9801317,9801110,etc |
| proportional counter array | PCA | 466 | 63 | 1.588675 | 9801168,9801251,etc |
| asymptotic giant branch | AGB | 694 | 61 | 1.313555 | 9801068,9801230,etc |
| supernova | SN | 1979 | 59 | 1.904414 | 9801256,9801205,etc |
| low mass x ray binary | LMXB | 675 | 59 | 1.375253 | 9801312,9801295,etc |
| color magnitude diagram | CMD | 873 | 57 | 1.826429 | 9802117,9802184,etc |
| red giant branch | RGB | 1096 | 54 | 1.965604 | 9802186,9802075,etc |
| equivalent width | EW | 804 | 53 | 1.360274 | 9801063,9801137,etc |
| quasi periodic oscillation | QPO | 1868 | 53 | 1.912833 | 9801226,9801075,etc |
| intergalactic medium | IGM | 549 | 51 | 1.334863 | 9801074,9801181,etc |
| very large array | VLA | 433 | 50 | 1.381217 | 9801086,9801205,etc |
| low surface brightness | LSB | 1067 | 48 | 1.441607 | 9801102,9801124,etc |
| cosmic microwave background radiation | CMBR | 607 | 46 | 1.349537 | 9801099,9801212,etc |
| all sky monitor | ASM | 389 | 46 | 1.480347 | 9801168,9801007,etc |
| white dwarf | WD | 1185 | 44 | 1.866423 | 9801206,9801034,etc |
| ultraviolet | UV | 1203 | 44 | 1.730564 | 9801088,9801207,etc |
| far infrared | FIR | 647 | 44 | 1.525213 | 9801198,9801130,etc |
| horizontal branch | HB | 1219 | 44 | 1.91365 | 9804339,9804147,etc |
| main sequence | MS | 868 | 43 | 1.653039 | 9802141,9802075,etc |
| broad line region | BLR | 415 | 41 | 1.684752 | 9801012,9801303,etc |
| dark matter | DM | 751 | 40 | 1.927556 | 9801176,9801290,etc |
| full width at half maximum | FWHM | 270 | 40 | 1.325946 | 9801238,9801146,etc |
| high resolution imager | HRI | 638 | 40 | 1.701429 | 9801317,9801238,etc |
| position sensitive proportional counter | PSPC | 736 | 39 | 1.565742 | 9801317,9801238,etc |
| rossi x ray timing explorer | RXTE | 313 | 39 | 1.411981 | 9803018,9803267,etc |
| signal to noise ratio | S/N | 184 | 38 | 1.474257 | 9801063,9801091,etc |
| advection dominated accretion flow | ADAF | 833 | 37 | 1.597113 | 9802321,9802080,etc |
| intracluster medium | ICM | 522 | 35 | 1.717708 | 9801209,9801268,etc |
| sloan digital sky survey | SDSS | 322 | 35 | 1.40208 | 9802231,9802133,etc |
| faint object spectrograph | FOS | 367 | 34 | 1.853767 | 9801136,9801302,etc |
| kolmogorov smirnov | KS | 169 | 33 | 1.212562 | 9801137,9801051,etc |
| burst and transient source experiment | BATSE | 377 | 33 | 1.547231 | 9801168,9801043,etc |
| cataclysmic variable | CV | 747 | 32 | 1.628222 | 9801101,9801206,etc |
| infrared space observatory | ISO | 511 | 31 | 1.776569 | 9801134,9801083,etc |
| equation of state | EOS | 378 | 30 | 1.701304 | 9801320,9801200,etc |
| small magellanic cloud | SMC | 666 | 30 | 1.87058 | 9802003,9802058,etc |
| near infrared | NIR | 265 | 30 | 1.767979 | 9802144,9802140,etc |
| smoothed particle hydrodynamics | SPH | 575 | 29 | 1.484723 | 9802311,9802004,etc |
| rosat all sky survey | RASS | 248 | 29 | 1.414983 | 9803175,9803248,etc |
| australia telescope compact array | ATCA | 181 | 28 | 1.358281 | 9801249,9801024,etc |
| narrow line region | NLR | 277 | 28 | 1.394177 | 9801086,9801303,etc |
| giant molecular cloud | GMC | 163 | 28 | 1.215015 | 9801164,9801319,etc |
| globular cluster | GC | 1556 | 28 | 2.006445 | 9802307,9802100,etc |
| tully fisher | TF | 950 | 27 | 1.744508 | 9801256,9801307,etc |
| large scale structure | LSS | 221 | 26 | 1.616776 | 9803319,9803168,etc |
| james clerk maxwell telescope | JCMT | 112 | 26 | 1.231181 | 9803294,9803230,etc |
| black hole | BH | 887 | 25 | 1.68428 | 9801298,9801283,etc |
| infrared | IR | 784 | 25 | 1.923188 | 9801216,9801112,etc |
| signal to noise | S/N | 124 | 25 | 1.440368 | 9803175,9803208,etc |
| high surface brightness | HSB | 316 | 24 | 1.584812 | 9801102,9801124,etc |
| sunyaev zel'dovich | SZ | 609 | 24 | 1.794928 | 9801099,9801175,etc |
| big bang nucleosynthesis | BBN | 256 | 24 | 1.75225 | 9802005,9802317,etc |
| new technology telescope | NTT | 86 | 24 | 1.208961 | 9803134,9803175,etc |
| star formation | SF | 477 | 23 | 1.785114 | 9801227,9801089,etc |
| position angle | PA | 174 | 23 | 1.522652 | 9801063,9801210,etc |
| inverse compton | IC | 451 | 23 | 2.0024 | 9803237,9803020,etc |
| ultraluminous infrared galaxy | ULIRG | 547 | 22 | 1.822194 | 9801198,9801316,etc |
| x ray background | XRB | 283 | 22 | 1.775483 | 9804062,9804143,etc |
| wide field camera | WF | 181 | 21 | 1.763095 | 9801086,9801051,etc |
| high velocity cloud | HVC | 625 | 21 | 1.57502 | 9806020,9806178,etc |
| fundamental plane | FP | 741 | 20 | 1.903226 | 9801078,9801143,etc |
| local thermodynamic equilibrium | LTE | 340 | 20 | 1.502594 | 9802049,9802353,etc |
| william herschel telescope | WHT | 81 | 19 | 1.158376 | 9801227,9801137,etc |
| nordic optical telescope | NOT | 76 | 19 | 1.158553 | 9801186,9801150,etc |
| cosmic ray | CR | 279 | 19 | 1.739065 | 9805365,9805231,etc |
| neutron star | NS | 664 | 18 | 1.838066 | 9801127,9801034,etc |
| black hole candidate | BHC | 225 | 18 | 2.001116 | 9802339,9802242,etc |
| full width half maximum | FWHM | 86 | 18 | 1.33394 | 9803327,9803140,etc |
| goddard high resolution spectrograph | GHRS | 154 | 18 | 1.445001 | 9803215,9803148,etc |
| wolf rayet | WR | 716 | 18 | 1.728465 | 9803065,9803005,etc |
| european southern observatory | ESO | 81 | 18 | 1.000426 | 9804337,9804052,etc |
| compton gamma ray observatory | CGRO | 49 | 18 | 1.167032 | 9806170,9806175,etc |
| field of view | FOV | 93 | 17 | 1.353802 | 9801086,9801275,etc |
| wide field planetary camera 2 | WFPC2 | 191 | 16 | 1.438397 | 9802167,9802088,etc |
| local group | LG | 338 | 16 | 1.377724 | 9804066,9804169,etc |
| singular isothermal sphere | SIS | 85 | 15 | 1.400528 | 9802139,9802107,etc |
| friedmann robertson walker | FRW | 92 | 15 | 1.134081 | 9804062,9804150,etc |
| canada france redshift survey | CFRS | 194 | 15 | 1.135635 | 9805155,9805262,etc |
| brightest cluster galaxy | BCG | 213 | 14 | 1.430244 | 9801190,9801277,etc |
| period luminosity | PL | 214 | 14 | 1.504006 | 9801242,9801093,etc |
| hot dark matter | HDM | 156 | 14 | 1.859517 | 9801320,9801234,etc |
| high energy x ray timing experiment | HEXTE | 113 | 14 | 1.144577 | 9804173,9804228,etc |
| local standard of rest | LSR | 67 | 13 | 1.154153 | 9801281,9801164,etc |
| extreme ultraviolet | EUV | 159 | 13 | 1.387786 | 9801153,9801270,etc |
| three dimensional | 3D | 72 | 13 | 1.154935 | 9802235,9802004,etc |
| planetary camera | PC | 180 | 13 | 2.000429 | 9802117,9802184,etc |
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