| INTERPLANETARY | Patently rare in travelling between Earth and Mars for example (14) |
| PLANETARY | Inter____ (between earth and Mars for example) |
| GODS | Mercury and Mars, for example |
| EROS | Asteroid between Earth and Mars |
| TOINGANDFROING | A lot of possibly unproductive activity travelling between places? (5,3,6) |
| STYX | In Greek mythology, the river that forms the boundary between Earth and the Underworld (4) |
| EREBUS | In there busily between Earth and Hades (6) |
| RAILCARD | Learner driver gets transport during Blitz for travelling between London and Paris (8) |
| SUEZ | Canal that provides an important shortcut for vessels travelling between Europe and America cutting |
| CHANNELCROSSING | Swapping between TV stations while travelling between England and France (7,8) |
| EYESHADES | Visual defence of word of agreement between earth and the underworld (9) |
| MILE | One of about 93 million between Earth and the sun |
| PATH | Way to walk between earth and water (7,4) |
| COASTAL | Way to walk between earth and water (7,4) |
| WARGOD | Mars, for example, board game in hospital wing (3,3) |
| PLANET | Mars, for example, track in gym (6) |
| ERASMUS | 'Earth and Mars Rocks' by American scholar (7) |
| INNER | Like the planets Mercury, Venus, Earth and Mars |
| RIVERSTYX | Boundary between Earth and Hades |
| MARS | Planet between Earth and Jupiter |
