How many years in operation did the International Space Station mark on November 20, 2018_________?
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Answer: D. 20 years
Explanation
The International Space Station marked exactly 20 years of continuous human habitation and operation. This major aerospace milestone was celebrated twenty years after its first module launched. The foundational module named Zarya successfully lifted into orbit on November 20, 1998. The space station represents a massive cooperative engineering achievement involving multiple global space agencies. Astronauts and cosmonauts live aboard the orbiting laboratory to conduct vital scientific research continuously. Maintaining the complex orbital outpost requires regular cargo resupply missions and spacewalking maintenance.
Long-term space habitation provides invaluable data on how human bodies adapt to microgravity environments. International scientific collaboration in space demonstrates that nations can work together peacefully for progress. Technology developed for orbital stations often trickles down to improve everyday life on Earth. Option A overestimates the operational duration by calculating an incorrect number of years since launch. Option B incorrectly counts twenty-one years instead of the actual two-decade milestone anniversary. Option C underestimates the elapsed time since the historic deployment of the initial module.
- Subject
- Current Affairs
- Category
- World Current Affairs
- Topic
- —
- Difficulty
- medium
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