| 1 | cosmic microwave background | CMB | 325 | 17 | 2.003852 | 9708202,9708018,etc |
| 2 | cold dark matter | CDM | 197 | 15 | 2.00155 | 9708090,9708018,etc |
| 3 | initial mass function | IMF | 164 | 11 | 1.001793 | 9708178,9708177,etc |
| 4 | nasa/ipac extragalactic database | NED | 17 | 10 | 1.000247 | 9708050,9708165,etc |
| 5 | active galactic nucleus | AGN | 154 | 10 | 1.004985 | 9708030,9708116,etc |
| 6 | large magellanic cloud | LMC | 217 | 10 | 2.004274 | 9708100,9708106,etc |
| 7 | point spread function | PSF | 93 | 9 | 2.001435 | 9708037,9708103,etc |
| 8 | hubble space telescope | HST | 71 | 7 | 2.001515 | 9708025,9708237,etc |
| 9 | signal to noise ratio | S/N | 22 | 6 | 1.00039 | 9708090,9708104,etc |
| 10 | position sensitive proportional counter | PSPC | 61 | 6 | 2.001194 | 9708073,9708046,etc |
| 11 | interstellar medium | ISM | 79 | 6 | 2.001416 | 9708046,9708106,etc |
| 12 | spectral energy distribution | SED | 71 | 6 | 2.002687 | 9708104,9708197,etc |
| 13 | red giant branch | RGB | 187 | 6 | 2.001709 | 9708099,9708232,etc |
| 14 | equivalent width | EW | 59 | 5 | 1.000918 | 9708098,9708030,etc |
| 15 | gamma ray burst | GRB | 198 | 5 | 2.005769 | 9708130,9708159,etc |
| 16 | color magnitude diagram | CMD | 97 | 5 | 2.001063 | 9708232,9708210,etc |
| 17 | horizontal branch | HB | 568 | 5 | 2.00945 | 9708232,9708210,etc |
| 18 | asymptotic giant branch | AGB | 65 | 5 | 2.001312 | 9708232,9708210,etc |
| 19 | probability distribution function | PDF | 63 | 4 | 2.002541 | 9708018,9708041,etc |
| 20 | cataclysmic variable | CV | 42 | 4 | 1.00298 | 9708188,9708227,etc |
| 21 | rosat all sky survey | RASS | 16 | 4 | 1.000342 | 9708211,9708049,etc |
| 22 | colour magnitude diagram | CMD | 18 | 4 | 2.000178 | 9708209,9708061,etc |
| 23 | intergalactic medium | IGM | 24 | 3 | 1.000572 | 9708018,9708213,etc |
| 24 | broad emission line region | BELR | 22 | 3 | 2.000507 | 9708050,9708046,etc |
| 25 | globular cluster | GC | 429 | 3 | 2.01483 | 9708025,9708096,etc |
| 26 | low mass x ray binary | LMXB | 124 | 3 | 2.00336 | 9708188,9708002,etc |
| 27 | supernova | SN | 32 | 3 | 2.001562 | 9708188,9708262,etc |
| 28 | international ultraviolet explorer | IUE | 6 | 3 | 1.000044 | 9708073,9708263,etc |
| 29 | narrow emission line galaxy | NELG | 26 | 3 | 2.001005 | 9708046,9708231,etc |
| 30 | ultraviolet | UV | 264 | 3 | 2.008105 | 9708163,9708056,etc |
| 31 | hubble deep field | HDF | 25 | 3 | 2.004485 | 9708163,9708209,etc |
| 32 | x ray background | XRB | 27 | 3 | 2.001 | 9708227,9708088,etc |
| 33 | very large array | VLA | 8 | 3 | 2.000283 | 9708227,9708062,etc |
| 34 | united kingdom infrared telescope | UKIRT | 12 | 3 | 1.000177 | 9708227,9708226,etc |
| 35 | white dwarf | WD | 63 | 3 | 2.005148 | 9708178,9708006,etc |
| 36 | supernova remnant | SNR | 140 | 3 | 2.006727 | 9708106,9708087,etc |
| 37 | luminosity function | LF | 70 | 3 | 1.002256 | 9708232,9708226,etc |
| 38 | local group | LG | 61 | 3 | 1.000986 | 9708102,9708141,etc |
| 39 | small magellanic cloud | SMC | 35 | 3 | 2.006401 | 9708017,9708081,etc |
| 40 | main sequence | MS | 7 | 3 | 1.000492 | 9708096,9708081,etc |