| 1 | active galactic nucleus | AGN | 199 | 21 | 1.002335 | 9803200,9803044,etc |
| 2 | cosmic microwave background | CMB | 266 | 15 | 2.00562 | 9803177,9803250,etc |
| 3 | cold dark matter | CDM | 109 | 14 | 1.001626 | 9803319,9803236,etc |
| 4 | nasa/ipac extragalactic database | NED | 26 | 13 | 1.000299 | 9803295,9803253,etc |
| 5 | interstellar medium | ISM | 111 | 12 | 1.001464 | 9803283,9803308,etc |
| 6 | point spread function | PSF | 60 | 12 | 2.000435 | 9803287,9803253,etc |
| 7 | initial mass function | IMF | 123 | 10 | 1.001659 | 9803157,9803249,etc |
| 8 | supernova | SN | 232 | 8 | 2.003397 | 9803283,9803284,etc |
| 9 | hubble space telescope | HST | 66 | 8 | 1.001081 | 9803167,9803130,etc |
| 10 | quasi periodic oscillation | QPO | 263 | 7 | 2.008335 | 9803018,9803267,etc |
| 11 | zero age main sequence | ZAMS | 43 | 7 | 2.000393 | 9803138,9803296,etc |
| 12 | ultraviolet | UV | 25 | 6 | 1.000374 | 9803257,9803200,etc |
| 13 | main sequence | MS | 200 | 6 | 2.002307 | 9803134,9803167,etc |
| 14 | proportional counter array | PCA | 33 | 6 | 1.000616 | 9803018,9803267,etc |
| 15 | low mass x ray binary | LMXB | 86 | 6 | 2.00346 | 9803267,9803278,etc |
| 16 | supernova remnant | SNR | 47 | 6 | 1.001984 | 9803273,9803214,etc |
| 17 | large magellanic cloud | LMC | 67 | 5 | 1.004355 | 9803228,9803301,etc |
| 18 | luminosity function | LF | 128 | 5 | 2.001445 | 9803283,9803274,etc |
| 19 | color magnitude diagram | CMD | 124 | 5 | 2.001541 | 9803274,9803035,etc |
| 20 | planetary nebula | PN | 17 | 4 | 1.000281 | 9803255,9803134,etc |
| 21 | broad line region | BLR | 58 | 4 | 2.007362 | 9803283,9803307,etc |
| 22 | intracluster medium | ICM | 30 | 4 | 1.000752 | 9803283,9803059,etc |
| 23 | gamma ray burst | GRB | 317 | 4 | 2.012755 | 9803217,9803249,etc |
| 24 | rossi x ray timing explorer | RXTE | 21 | 4 | 1.000609 | 9803018,9803267,etc |
| 25 | advection dominated accretion flow | ADAF | 224 | 4 | 2.005586 | 9803112,9803141,etc |
| 26 | hubble deep field | HDF | 19 | 4 | 1.001435 | 9803011,9803279,etc |
| 27 | giant molecular cloud | GMC | 15 | 4 | 2.000267 | 9803108,9803295,etc |
| 28 | spectral energy distribution | SED | 15 | 4 | 1.00034 | 9803274,9803205,etc |
| 29 | white dwarf | WD | 47 | 4 | 1.00116 | 9803284,9803081,etc |
| 30 | galactic center | GC | 43 | 4 | 1.001986 | 9803271,9803247,etc |
| 31 | nasa extragalactic database | NED | 15 | 4 | 2.000415 | 9803099,9803039,etc |
| 32 | star formation rate | SFR | 73 | 4 | 2.001639 | 9803147,9803156,etc |
| 33 | rosat all sky survey | RASS | 29 | 4 | 1.000506 | 9803175,9803248,etc |
| 34 | signal to noise | S/N | 26 | 4 | 1.000671 | 9803175,9803208,etc |
| 35 | position sensitive proportional counter | PSPC | 100 | 4 | 2.002439 | 9803285,9803208,etc |
| 36 | equivalent width | EW | 118 | 4 | 1.002999 | 9803205,9803051,etc |
| 37 | long period variable | LPV | 12 | 3 | 1.000484 | 9803027,9803274,etc |
| 38 | new technology telescope | NTT | 11 | 3 | 1.00034 | 9803134,9803175,etc |
| 39 | low energy concentrator spectrometer | LECS | 19 | 3 | 2.000785 | 9803129,9803015,etc |
| 40 | low surface brightness | LSB | 87 | 3 | 2.003984 | 9803308,9803031,etc |
| 41 | broad emission line region | BLR | 77 | 3 | 2.006006 | 9803044,9803183,etc |
| 42 | asymptotic giant branch | AGB | 43 | 3 | 2.001922 | 9803274,9803276,etc |
| 43 | rotation measure | RM | 31 | 3 | 2.001272 | 9803196,9803280,etc |
| 44 | proportional counter unit | PCU | 6 | 3 | 1.000231 | 9803267,9803278,etc |
| 45 | australia telescope compact array | ATCA | 18 | 3 | 1.000809 | 9803286,9803273,etc |
| 46 | united kingdom infrared telescope | UKIRT | 10 | 3 | 1.000249 | 9803253,9803017,etc |
| 47 | soft x ray transient | SXT | 50 | 3 | 2.00099 | 9803141,9803303,etc |
| 48 | field of view | FOV | 22 | 3 | 2.000357 | 9803214,9803153,etc |
| 49 | westerbork synthesis radio telescope | WSRT | 50 | 3 | 2.000894 | 9803222,9803243,etc |
| 50 | full width half maximum | FWHM | 7 | 3 | 1.000117 | 9803327,9803140,etc |
| 51 | cataclysmic variable | CV | 29 | 3 | 2.001708 | 9803081,9803234,etc |
| 52 | full width at half maximum | FWHM | 40 | 3 | 2.002121 | 9803131,9803326,etc |