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What activity did Worden perform on Apollo 15's return flight to Earth that no one else had done at such a distance?

  • Moonwalk

  • Extravehicular activity

  • Distant communication

  • Navigation adjustments

Answer

The answer to the question is extravehicular activity (EVA). EVA refers to any activity that an astronaut performs outside of a spacecraft while in space. During Apollo 15's return flight to Earth, astronaut Al Worden performed an EVA at a record-breaking distance from Earth.
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