| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | pluto | NASA scientists | Considered the ninth planet in the solar system until 2006 when it was reclassified as a dwarf planet | 1 |
| 2 | terrestrial planet | NASA scientists | Terrestrial planets include Mercury, Venus, Earth, and Mars | 1 |
| 3 | terrestrial planet | NASA scientists | Terrestrial planets are rocky and have solid surfaces, such as Earth, Mars, and Venus. | 1 |
| 4 | terrestrial planet | NASA scientists | Terrestrial planets are rocky, have solid surfaces, and are found closer to the sun in our solar system. | 1 |