| active galactic nucleus | AGN | 200 | 15 | 2.001321 | 9801313,9801226,etc |
| cold dark matter | CDM | 204 | 12 | 2.003499 | 9801284,9801320,etc |
| cosmic microwave background | CMB | 134 | 11 | 2.00182 | 9801121,9801291,etc |
| nasa/ipac extragalactic database | NED | 24 | 9 | 1.000713 | 9801063,9801137,etc |
| hubble space telescope | HST | 87 | 9 | 1.001458 | 9801321,9801190,etc |
| white dwarf | WD | 186 | 9 | 2.002374 | 9801206,9801034,etc |
| hubble deep field | HDF | 123 | 9 | 1.002579 | 9801057,9801296,etc |
| star formation rate | SFR | 96 | 9 | 2.002161 | 9801279,9801320,etc |
| initial mass function | IMF | 64 | 8 | 1.001085 | 9801321,9801131,etc |
| luminosity function | LF | 184 | 8 | 1.003336 | 9801016,9801227,etc |
| supernova | SN | 360 | 8 | 2.008766 | 9801256,9801205,etc |
| equivalent width | EW | 115 | 7 | 1.001272 | 9801063,9801137,etc |
| tully fisher | TF | 258 | 7 | 1.004973 | 9801256,9801307,etc |
| point spread function | PSF | 54 | 7 | 2.000902 | 9801100,9801086,etc |
| spectral energy distribution | SED | 64 | 7 | 1.0021 | 9801288,9801062,etc |
| intergalactic medium | IGM | 61 | 7 | 1.003142 | 9801074,9801181,etc |
| large magellanic cloud | LMC | 39 | 6 | 2.000662 | 9801321,9801051,etc |
| interstellar medium | ISM | 97 | 6 | 2.001099 | 9801131,9801181,etc |
| quasi periodic oscillation | QPO | 160 | 6 | 2.008287 | 9801226,9801075,etc |
| william herschel telescope | WHT | 38 | 5 | 1.000893 | 9801227,9801137,etc |
| kolmogorov smirnov | KS | 25 | 5 | 1.000208 | 9801137,9801051,etc |
| neutron star | NS | 121 | 5 | 2.005944 | 9801127,9801034,etc |
| gamma ray burst | GRB | 111 | 5 | 2.007619 | 9801182,9801320,etc |
| black hole | BH | 172 | 5 | 1.004278 | 9801298,9801283,etc |
| wide field camera | WF | 20 | 4 | 2.001017 | 9801086,9801051,etc |
| low mass x ray binary | LMXB | 37 | 4 | 1.001037 | 9801312,9801295,etc |
| supernova remnant | SNR | 62 | 4 | 2.002479 | 9801317,9801110,etc |
| infrared | IR | 220 | 4 | 2.000846 | 9801216,9801112,etc |
| asymptotic giant branch | AGB | 59 | 4 | 1.001116 | 9801068,9801230,etc |
| faint object spectrograph | FOS | 20 | 4 | 2.001454 | 9801136,9801302,etc |
| narrow line radio galaxy | NLRG | 8 | 3 | 1.00011 | 9801063,9801024,etc |
| extended emission line regions | EELR | 73 | 3 | 2.002876 | 9801063,9801249,etc |
| cataclysmic variable | CV | 50 | 3 | 2.001373 | 9801101,9801206,etc |
| very large array | VLA | 24 | 3 | 1.000703 | 9801086,9801205,etc |
| field of view | FOV | 15 | 3 | 1.00013 | 9801086,9801275,etc |
| nasa extragalactic database | NED | 19 | 3 | 2.001026 | 9801086,9801024,etc |
| star formation | SF | 22 | 3 | 1.0031 | 9801227,9801089,etc |
| ultraviolet | UV | 23 | 3 | 2.000765 | 9801088,9801207,etc |
| low surface brightness | LSB | 172 | 3 | 2.000594 | 9801102,9801124,etc |
| high surface brightness | HSB | 43 | 3 | 2.000448 | 9801102,9801124,etc |
| position sensitive proportional counter | PSPC | 51 | 3 | 1.000762 | 9801317,9801238,etc |
| dark matter | DM | 14 | 3 | 2.000553 | 9801176,9801290,etc |
| full width at half maximum | FWHM | 11 | 3 | 1.000409 | 9801238,9801146,etc |
| australia telescope compact array | ATCA | 23 | 3 | 1.000912 | 9801249,9801024,etc |
| brightest cluster galaxy | BCG | 125 | 3 | 2.006009 | 9801190,9801277,etc |
| cosmic microwave background radiation | CMBR | 41 | 3 | 2.000595 | 9801099,9801212,etc |
| broad line radio galaxy | BLRG | 10 | 3 | 1.000059 | 9801024,9801039,etc |
| proportional counter array | PCA | 26 | 3 | 1.000704 | 9801168,9801251,etc |