This video talks a lot about "reusable" rockets.
What does "reusable" mean in this context?
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Question #5
How long has Spirit been on Mars when this video was taken?
Question #3
What does the prefix "re–" mean?
Question #6
How does Mars help Opportunity with its mission?
Question #4
This video mentions the "microgravity" on Mars.
What does "microgravity" mean in this context?