| crescent moon(noun, system, space, cosmos) |
| dark matter(noun, system, space, cosmos) |
| deep space(noun, system, space, cosmos) |
| deneb(noun, system, space, cosmos) |
| doppler shift(noun, system, space, cosmos) |
| double star(noun, system, space, cosmos) |
| drake equation(noun, system, space, cosmos) |
| dwarf planet(noun, system, space, cosmos) |
| dwarf star(noun, system, space, cosmos) |
| earth(noun, system, space, cosmos) |
| eclipse(noun, system, space, cosmos) |
| ecliptic(noun, system, space, cosmos) |
| elliptical orbit(noun, system, space, cosmos) |
| escape velocity(noun, system, space, cosmos) |
| event horizon(noun, system, space, cosmos) |
| exoplanet(noun, system, space, cosmos) |
| falling star(noun, system, space, cosmos) |
| finder |
| full moon(noun, system, space, cosmos) |
| gamma ray(noun, system, space, cosmos) |