| Similarity | Rank | |
|---|---|---|
| PCGS | 0.760 | 53733 |
| nebula | 0.704 | 49393 |
| Messier | 0.689 | 84442 |
| nebulae | 0.687 | 81004 |
| CAC | 0.682 | 35207 |
| Nebula | 0.660 | 48795 |
| galaxies | 0.649 | 19979 |
| Hubble | 0.637 | 35333 |
| globular | 0.637 | 65901 |
| Telescope | 0.633 | 33291 |
| ISON | 0.628 | 79144 |
| quasars | 0.621 | 93060 |
| Comet | 0.618 | 30602 |
| ESO | 0.610 | 82637 |
| exoplanets | 0.603 | 89365 |
| CMB | 0.602 | 90582 |
| SN | 0.598 | 47787 |
| supernova | 0.597 | 46579 |
| comet | 0.589 | 23908 |
| Astronomers | 0.584 | 61630 |
| redshift | 0.582 | 88264 |
| Saturn's | 0.582 | 60708 |
| telescopes | 0.581 | 27127 |
| orbiting | 0.577 | 32947 |
| Ursa | 0.577 | 89545 |