What term was frequently used to describe space exploration before the development of modern rocketry?
Answer
Interplanetary travel
Before the mid-20th century, the concept of exploring space was largely confined to science fiction. During that era, the term interplanetary travel was the common descriptor for the idea of moving between planets. It was only as the science of rocketry evolved into a practical reality that a more precise and technical term like spaceflight was adopted to describe the specific mode of transportation.

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Pronunciation of the word(s) "Spaceflight". - YouTube
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