Definitions
Wiktionary
- n. astronomy That part of outer space between the planets of a solar system and its star
WordNet 3.0
- n. the part of outer space within the solar system
Examples
“Earth's most recent moons still included more than a score of destroyer-sized spacecraft; but the mother ship had disappeared into interplanetary space with half its retinue, and the remaining ships seemed to be doing nothing.”
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