| Similarity | Rank | |
|---|---|---|
| spectra | 0.788 | 25572 |
| spectroscopy | 0.688 | 29325 |
| spectrometer | 0.623 | 46182 |
| wavelength_of | 0.614 | 44330 |
| NGC_[number] | 0.612 | 64522 |
| wavelength | 0.605 | 18465 |
| at_[number]_nm | 0.600 | 89440 |
| fluorescence | 0.595 | 31271 |
| quasar | 0.592 | 61018 |
| reflectance | 0.586 | 69752 |
| physical_property_of | 0.581 | 62578 |
| crystal_structure | 0.579 | 74059 |
| gamma_ray | 0.579 | 77142 |
| chemical_composition | 0.578 | 69659 |
| excitation | 0.577 | 42253 |
| visible_light | 0.573 | 54663 |
| luminosity | 0.567 | 61003 |
| diffraction | 0.567 | 70190 |
| hydrogen_atom | 0.564 | 96670 |
| the_spatial_distribution_of | 0.563 | 84710 |
| ultraviolet | 0.561 | 74117 |
| spectral | 0.556 | 40533 |
| exposure_time | 0.555 | 98193 |
| the_spectrum_of | 0.554 | 32610 |
| correlation_of | 0.553 | 33439 |