| consist of two stars | 0.68 |
| orbit each other | 0.62 |
| eclipse each other | 0.35 |
| look like fiery dragon | 0.31 |
| speed towards earth | 0.31 |
| happen to orbit in plane | 0.25 |
| orbit black hole | 0.25 |
| white dwarf | 0.25 |
| cataclysmic variable st… | 0.25 |
| super soft x-ray sources | 0.25 |
| common | 0.54 |
| a star system | 0.52 |
| just one star | 0.31 |