| active galactic nucleus | AGN | 447 | 30 | 2.004221 | 9903198,9903280,etc |
| cosmic microwave background | CMB | 565 | 28 | 1.003528 | 9903032,9903028,etc |
| interstellar medium | ISM | 256 | 24 | 1.001826 | 9903356,9903369,etc |
| nasa/ipac extragalactic database | NED | 36 | 19 | 1.000425 | 9903065,9903348,etc |
| star formation rate | SFR | 140 | 18 | 1.001718 | 9903038,9903121,etc |
| cold dark matter | CDM | 346 | 16 | 2.004074 | 9903164,9903335,etc |
| point spread function | PSF | 135 | 15 | 1.001514 | 9903447,9903120,etc |
| supernova remnant | SNR | 220 | 15 | 2.003933 | 9903244,9903369,etc |
| initial mass function | IMF | 75 | 15 | 1.000698 | 9903054,9903470,etc |
| spectral energy distribution | SED | 120 | 13 | 2.00371 | 9903456,9903340,etc |
| gamma ray burst | GRB | 327 | 12 | 2.009897 | 9903399,9903126,etc |
| full width at half maximum | FWHM | 66 | 10 | 1.000781 | 9903441,9903197,etc |
| all sky monitor | ASM | 89 | 9 | 2.002587 | 9903306,9903228,etc |
| ultraluminous infrared galaxy | ULIG | 225 | 9 | 2.006133 | 9903214,9903152,etc |
| low mass x ray binary | LMXB | 61 | 9 | 2.002162 | 9903450,9903106,etc |
| hubble space telescope | HST | 78 | 8 | 2.001539 | 9903018,9903490,etc |
| luminosity function | LF | 286 | 7 | 2.003819 | 9903456,9903286,etc |
| very large array | VLA | 46 | 7 | 1.000755 | 9903227,9903441,etc |
| asymptotic giant branch | AGB | 117 | 7 | 2.001878 | 9903018,9903017,etc |
| color magnitude diagram | CMD | 119 | 7 | 1.003014 | 9903258,9903120,etc |
| near infrared | NIR | 31 | 7 | 1.000769 | 9903340,9903463,etc |
| proportional counter array | PCA | 71 | 7 | 2.002192 | 9903083,9903062,etc |
| william herschel telescope | WHT | 41 | 7 | 1.000769 | 9903217,9903410,etc |
| quasi periodic oscillation | QPO | 341 | 7 | 2.008449 | 9903450,9903148,etc |
| australia telescope compact array | ATCA | 22 | 6 | 1.000118 | 9903448,9903016,etc |
| cosmic microwave background radiation | CMBR | 78 | 6 | 2.001822 | 9903361,9903460,etc |
| isaac newton telescope | INT | 25 | 6 | 1.00046 | 9903018,9903217,etc |
| james clerk maxwell telescope | JCMT | 19 | 6 | 2.000329 | 9903441,9903340,etc |
| far infrared | FIR | 83 | 6 | 1.001005 | 9903463,9903269,etc |
| field of view | FOV | 68 | 6 | 2.000881 | 9903490,9903302,etc |
| intergalactic medium | IGM | 123 | 6 | 2.002836 | 9903063,9903336,etc |
| supernova | SN | 755 | 6 | 2.01345 | 9903229,9903466,etc |
| wolf rayet | WR | 97 | 5 | 2.002732 | 9903018,9903197,etc |
| horizontal branch | HB | 381 | 5 | 2.006524 | 9903258,9903120,etc |
| digitized sky survey | DSS | 7 | 5 | 1.000228 | 9903398,9903269,etc |
| owens valley radio observatory | OVRO | 44 | 5 | 2.000535 | 9903441,9903463,etc |
| sloan digital sky survey | SDSS | 75 | 5 | 1.003073 | 9903396,9903081,etc |
| very high energy | VHE | 100 | 5 | 2.003047 | 9903244,9903263,etc |
| optical transient | OT | 141 | 5 | 2.006196 | 9903021,9903271,etc |
| main sequence | MS | 32 | 5 | 1.001136 | 9903120,9903329,etc |
| signal to noise | S/N | 33 | 5 | 1.000576 | 9903007,9903059,etc |
| position sensitive proportional counter | PSPC | 73 | 5 | 2.001894 | 9903269,9903355,etc |
| big bang nucleosynthesis | BBN | 48 | 5 | 2.002436 | 9903183,9903004,etc |
| hubble deep field | HDF | 108 | 5 | 1.001369 | 9903054,9903299,etc |
| kolmogorov smirnov | K-S | 21 | 5 | 1.001142 | 9903063,9903458,etc |
| equivalent width | EW | 19 | 5 | 1.000342 | 9903457,9903217,etc |
| black hole | BH | 191 | 5 | 1.008319 | 9903123,9903417,etc |
| synchrotron self compton | SSC | 47 | 4 | 1.002114 | 9903099,9903263,etc |
| large magellanic cloud | LMC | 91 | 4 | 1.003524 | 9903011,9903329,etc |
| low surface brightness | LSB | 58 | 4 | 2.003032 | 9903164,9903064,etc |
| red giant branch | RGB | 101 | 4 | 1.001839 | 9903258,9903120,etc |
| signal to noise ratio | SNR | 16 | 4 | 1.000244 | 9903441,9903228,etc |
| energetic particle | EP | 135 | 4 | 1.003317 | 9903356,9903369,etc |
| photomultiplier tube | PMT | 35 | 4 | 2.000447 | 9903244,9903342,etc |
| residual dark distribution | RDD | 20 | 4 | 1.00029 | 9903278,9903424,etc |
| compton gamma ray observatory | CGRO | 11 | 4 | 1.00037 | 9903180,9903492,etc |
| very long baseline interferometry | VLBI | 64 | 4 | 2.001429 | 9903042,9903390,etc |
| united kingdom infrared telescope | UKIRT | 31 | 4 | 1.000692 | 9903487,9903250,etc |
| cataclysmic variable | CV | 31 | 4 | 2.000382 | 9903058,9903328,etc |
| rossi x ray timing explorer | RXTE | 35 | 4 | 2.001047 | 9903062,9903311,etc |
| inverse compton | IC | 22 | 4 | 2.001056 | 9903044,9903321,etc |
| extended medium sensitivity survey | EMSS | 94 | 4 | 2.003087 | 9903044,9903117,etc |
| inner lindblad resonance | ILR | 63 | 4 | 2.00026 | 9903409,9903414,etc |
| burst and transient source experiment | BATSE | 51 | 4 | 1.004547 | 9903399,9903126,etc |
| polycyclic aromatic hydrocarbon | PAH | 93 | 4 | 2.001266 | 9903067,9903152,etc |
| next generation space telescope | NGST | 5 | 4 | 1.000101 | 9903336,9903229,etc |
| position angle | PA | 48 | 4 | 1.000836 | 9903390,9903314,etc |
| nasa extragalactic database | NED | 9 | 4 | 1.000776 | 9903443,9903250,etc |
| white dwarf | WD | 237 | 4 | 2.005764 | 9903229,9903254,etc |
| optical module | OM | 95 | 4 | 2.003699 | 9903342,9903341,etc |
| planetary nebula | PN | 30 | 4 | 1.00159 | 9903410,9903419,etc |
| wide field planetary camera 2 | WFPC2 | 36 | 3 | 1.00152 | 9903065,9903245,etc |
| dwarf spheroidal | dSph | 31 | 3 | 2.001724 | 9903065,9903017,etc |
| anglo australian telescope | AAT | 9 | 3 | 1.000225 | 9903456,9903016,etc |
| broad absorption line | BAL | 89 | 3 | 1.008304 | 9903140,9903063,etc |
| jacobus kapteyn telescope | JKT | 14 | 3 | 2.001656 | 9903133,9903060,etc |
| surface of last scattering | SLS | 25 | 3 | 2.00088 | 9903032,9903038,etc |
| local group | LG | 12 | 3 | 2.000044 | 9903348,9903430,etc |
| wide field camera | WFC | 40 | 3 | 1.002299 | 9903198,9903217,etc |
| high energy astrophysics science archive research center | HEASARC | 8 | 3 | 1.000055 | 9903198,9903278,etc |
| ultraviolet | UV | 123 | 3 | 1.003582 | 9903018,9903054,etc |
| intermediate dispersion spectrograph | IDS | 10 | 3 | 2.00005 | 9903018,9903226,etc |
| solid state imaging spectrometer | SIS | 34 | 3 | 2.000744 | 9903243,9903424,etc |
| las campanas redshift survey | LCRS | 24 | 3 | 2.001591 | 9903396,9903165,etc |
| rosat all sky survey | RASS | 38 | 3 | 1.003417 | 9903396,9903125,etc |
| equivalent widths | EW | 51 | 3 | 1.002781 | 9903197,9903130,etc |
| x ray background | XRB | 36 | 3 | 2.001931 | 9903447,9903336,etc |
| uk infrared telescope | UKIRT | 17 | 3 | 1.000434 | 9903340,9903410,etc |
| high surface brightness | HSB | 27 | 3 | 2.001205 | 9903184,9903064,etc |
| tully fisher relation | TFR | 62 | 3 | 1.003941 | 9903184,9903007,etc |
| nordic optical telescope | NOT | 13 | 3 | 1.000153 | 9903120,9903314,etc |
| imaging proportional counter | IPC | 46 | 3 | 2.001122 | 9903269,9903479,etc |
| x ray telescope | XRT | 13 | 3 | 2.000268 | 9903278,9903376,etc |
| right ascension | RA | 14 | 3 | 1.001591 | 9903271,9903223,etc |
| maximum entropy method | MEM | 14 | 3 | 2.000363 | 9903490,9903328,etc |
| fast fourier transform | FFT | 3 | 3 | 1.000219 | 9903490,9903290,etc |
| gas imaging spectrometer | GIS | 43 | 3 | 2.001194 | 9903424,9903376,etc |
| oriented scintillation spectrometer experiment | OSSE | 24 | 3 | 1.000561 | 9903424,9903247,etc |
| press schechter | PS | 11 | 3 | 1.00057 | 9903027,9903117,etc |
| star formation history | SFH | 40 | 3 | 2.000924 | 9903371,9903421,etc |
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