Interplanetary meaning

ĭn'tər-plăn'ĭ-tĕr'ē
Between planets.
adjective
2
0
Existing or occurring between planets.
adjective
2
1
Within the solar system but outside the atmosphere of any planet or the sun.
adjective
0
2
Existing or occurring between planets.

Humans are just beginning to explore interplanetary travel.

adjective
0
2
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Origin of interplanetary