| 1 | cosmic microwave background | CMB | 232 | 17 | 2.002625 | 9804062,9804004,etc |
| 2 | active galactic nucleus | AGN | 253 | 16 | 2.002607 | 9804068,9804118,etc |
| 3 | point spread function | PSF | 123 | 16 | 2.001735 | 9804118,9804141,etc |
| 4 | interstellar medium | ISM | 263 | 13 | 2.004196 | 9804086,9804330,etc |
| 5 | nasa/ipac extragalactic database | NED | 18 | 12 | 1.000172 | 9804135,9804333,etc |
| 6 | hubble deep field | HDF | 84 | 9 | 1.004357 | 9804086,9804141,etc |
| 7 | hubble space telescope | HST | 92 | 9 | 1.001005 | 9804340,9804081,etc |
| 8 | spectral energy distribution | SED | 68 | 9 | 2.001382 | 9804033,9804299,etc |
| 9 | initial mass function | IMF | 125 | 9 | 1.00126 | 9804261,9804115,etc |
| 10 | red giant branch | RGB | 122 | 7 | 2.001988 | 9804340,9804339,etc |
| 11 | high resolution imager | HRI | 64 | 7 | 2.001562 | 9804201,9804200,etc |
| 12 | cold dark matter | CDM | 93 | 6 | 2.001702 | 9804062,9804015,etc |
| 13 | luminosity function | LF | 153 | 6 | 2.004569 | 9804071,9804244,etc |
| 14 | star formation rate | SFR | 61 | 6 | 1.001199 | 9804049,9804058,etc |
| 15 | proportional counter array | PCA | 48 | 6 | 2.00207 | 9804135,9804173,etc |
| 16 | asymptotic giant branch | AGB | 111 | 6 | 1.004256 | 9804339,9804003,etc |
| 17 | equivalent width | EW | 57 | 5 | 1.001488 | 9804307,9804218,etc |
| 18 | color magnitude diagram | CMD | 68 | 5 | 2.00116 | 9804340,9804339,etc |
| 19 | low mass x ray binary | LMXB | 76 | 5 | 1.001642 | 9804108,9804054,etc |
| 20 | japan society for promotion of science | JSPS | 5 | 5 | 1.000045 | 9804069,9804220,etc |
| 21 | position sensitive proportional counter | PSPC | 59 | 5 | 1.002604 | 9804210,9804197,etc |
| 22 | low resolution imaging spectrograph | LRIS | 39 | 5 | 1.000742 | 9804333,9804005,etc |
| 23 | horizontal branch | HB | 207 | 5 | 2.010436 | 9804339,9804147,etc |
| 24 | cosmic microwave background radiation | CMBR | 87 | 5 | 2.00277 | 9804051,9804150,etc |
| 25 | low surface brightness | LSB | 89 | 5 | 2.004626 | 9804244,9804202,etc |
| 26 | main sequence | MS | 61 | 4 | 2.001161 | 9804334,9804071,etc |
| 27 | friedmann robertson walker | FRW | 58 | 4 | 1.000892 | 9804062,9804150,etc |
| 28 | sloan digital sky survey | SDSS | 7 | 4 | 1.00037 | 9804062,9804250,etc |
| 29 | ultraviolet | UV | 229 | 4 | 2.009818 | 9804086,9804135,etc |
| 30 | far infrared | FIR | 56 | 4 | 2.001995 | 9804086,9804055,etc |
| 31 | quasi periodic oscillation | QPO | 28 | 4 | 2.003461 | 9804268,9804325,etc |
| 32 | very large array | VLA | 50 | 4 | 2.001347 | 9804163,9804102,etc |
| 33 | wide field cameras | WFC | 10 | 4 | 1.00071 | 9804163,9804299,etc |
| 34 | large magellanic cloud | LMC | 47 | 4 | 1.00353 | 9804340,9804295,etc |
| 35 | rossi x ray timing explorer | RXTE | 23 | 4 | 2.001248 | 9804128,9804228,etc |
| 36 | high surface brightness | HSB | 40 | 4 | 2.001175 | 9804049,9804202,etc |
| 37 | supernova remnant | SNR | 81 | 4 | 2.00278 | 9804208,9804029,etc |
| 38 | globular cluster | GC | 683 | 4 | 2.010391 | 9804339,9804319,etc |
| 39 | synchrotron self compton | SSC | 44 | 4 | 2.002824 | 9804102,9804198,etc |
| 40 | x ray background | XRB | 31 | 3 | 2.000607 | 9804062,9804143,etc |
| 41 | near infrared | NIR | 12 | 3 | 1.001028 | 9804086,9804143,etc |
| 42 | intergalactic medium | IGM | 26 | 3 | 1.00277 | 9804086,9804280,etc |
| 43 | interplanetary network | IPN | 11 | 3 | 2.000562 | 9804271,9804163,etc |
| 44 | hubble deep field south | HDF-S | 26 | 3 | 2.003223 | 9804027,9804018,etc |
| 45 | national aeronautics and space administration | NASA | 8 | 3 | 1.000322 | 9804141,9804340,etc |
| 46 | large scale structure | LSS | 13 | 3 | 1.00023 | 9804141,9804143,etc |
| 47 | local thermodynamic equilibrium | LTE | 105 | 3 | 2.003303 | 9804288,9804231,etc |
| 48 | narrow field instruments | NFI | 13 | 3 | 1.000407 | 9804163,9804270,etc |
| 49 | national radio astronomy observatory | NRAO | 5 | 3 | 1.000009 | 9804112,9804102,etc |
| 50 | william herschel telescope | WHT | 15 | 3 | 1.000212 | 9804307,9804194,etc |
| 51 | all sky monitor | ASM | 25 | 3 | 1.002005 | 9804307,9804173,etc |
| 52 | point response function | PRF | 7 | 3 | 1.001105 | 9804201,9804200,etc |
| 53 | color magnitude | CM | 33 | 3 | 2.000326 | 9804069,9804286,etc |
| 54 | advection dominated accretion flow | ADAF | 15 | 3 | 1.000914 | 9804054,9804251,etc |
| 55 | post asymptotic giant branch | PAGB | 19 | 3 | 2.00064 | 9804339,9804164,etc |
| 56 | cataclysmic variable | CV | 15 | 3 | 2.000094 | 9804002,9804063,etc |
| 57 | space telescope science institute | STScI | 8 | 3 | 1.000047 | 9804194,9804281,etc |
| 58 | australia telescope compact array | ATCA | 20 | 3 | 2.000753 | 9804298,9804105,etc |
| 59 | signal to noise | S/N | 9 | 3 | 1.000237 | 9804072,9804229,etc |