| 100% | KERN | 4 | Adjust the spacing of, in typography |
| 80% | KERN | 4 | Adjust the spacing between, in typography |
| 60% | HEMS | 4 | Adjusts the length of, in a way |
| 59% | KERNING | 7 | In typography, adjusting spaces between letters |
| 57% | XHEIGHT | 7 | In typography, the space filled by the 24th letter |
| 55% | UBIETY | 6 | The state of existing in space |
| 53% | ASTRONOMY | 9 | The study of planets and other objects in space |
| 53% | BSIX | 4 | Space in the left row of a game card |
| 52% | MAE | 3 | Jemison in the International Space Hall of Fame |
| 51% | BRANCUSI | 8 | Romanian sculptor of Bird in Space and The Kiss |
| 50% | HOUSTON | 7 | Inland port in southeast Texas; site of the Johnson Space Center |
| 50% | MARINER | 7 | Pair of Martian space probes launched by the US in 1969 |
| 50% | APE | 3 | Bone smasher in the opening scene of "2001: A Space Odyssey" |
| 50% | KERN | 4 | Adjust the spacing between letters |
| 49% | MONOLITH | 8 | Large column of stone, like in the movie "2001: A Space Odyssey" |
| 49% | MAE | 3 | Jemison in the Space and Women's Halls of Fame |
| 49% | STERIC | 6 | Relating to the arrangement of atoms in space |
| 48% | DAVE | 4 | Only character shown in the final 30 minutes of "2001: A Space Odyssey" |
| 48% | KERNS | 5 | Adjusts the spacing between, as typed letters |
| 48% | APES | 4 | Extras in the opening of "2001: A Space Odyssey" |
| 48% | HYDRAULIC | 9 | Driven by the movement of liquid in confined spaces |
| 48% | LAIKA | 5 | Name of the first dog in space |
| 48% | PAYDAY | 6 | Recurrent space in The Game of Life |
| 48% | HOUSTON | 7 | Inland port in SE Texas, US; site of the Lyndon B Johnson Space Center |
| 47% | YONDU | 5 | Fictional space pirate played by Michael Rooker in the 2014 film "Guardians of the Galaxy" |
| 47% | TUNE | 4 | Adjust the pitch of |
| 47% | REHEM | 5 | Adjust the length of |
| 47% | REDEFINES | 9 | Adjusts the parameters of |
| 46% | HOUSTON | 7 | A center of space research in the United States |
| 46% | HYDROGEN | 8 | In its liquid form it is the signature fuel of NASA space programs, using 10 million lbs. annually |