| Subject | English | Japanese |
| gen. | n interplanetary cruise | 惑星間航行 (わくせいかん・こうこう) |
| phys. | interplanetary magnetic field | 惑星間磁場 (わくせいかん・ぢば) |
| phys. | interplanetary matter | 惑星間物質 (わくせいかん・ぶっしつ) |
| phys. | interplanetary plasma | 惑星間プラズマ (wakuseikan-purazuma) |
| gen. | interplanetary space | 惑星間空間 (wakuseikan-kūkan) |
| gen. | interplanetary spacecraft | 惑星探査機 (probe) |