PRIMA’s Phase B milestone was conditional development progress
A targeted launch year is not an accomplished flight.
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Sources checked 26 October 2026.
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Try 2 questions about this story, then explain one idea in your own words. Check the text whenever you need to.
In this lesson: Distinguish development progress and intended contributions from delivered hardware and completed flight.
Grammar in this story: Alternatives with rather than
rather than completed hardware delivery
“Rather than” contrasts the selected or described option with an alternative. Example: “We checked the record rather than guessing.”
Your turn
Explain why selection for development does not mean a space mission is ready to launch.
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Design and technology work still precede implementation and flight. PRIMA also required a confirmation review before moving to implementation.
Your answer can be different. Give a reason and use your own words.
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