Table 3 Top keywords under each topic in titles of LDA results.
No. | Top ten terms under each topic | |||
|---|---|---|---|---|
Topic 1: Terrestrial experience | Topic 2: Achievements by China | Topic 3: Commercial enterprises | Topic 4: Space exploration | |
1 | Universe | Shenzhou | Space | Plan |
2 | Space | Space station | Virgin | Mars |
3 | Travel | Spaceflight | Galactic | Launch |
4 | Exploration | Space | Travel | Flight |
5 | Spaceflight | Manned | Branson | Episode |
6 | Child-parent | Astronaut | Episode | Voyager |
7 | Good-place to go | No. 13 | Tourism | Satellite |
8 | Children | Aerospace | Commercial | Earth |
9 | Play | Spacecraft | Founder | Solar system |
10 | Experience | Launch | Test-flight | Movies |
