Is it possible in principle for a human being who has a life expectancy of 70 years to make a round-trip journey to a part of the universe thousands of light-years distant? Explain.

Yes it is possible

Explanation: Due to the theory of relativity, the ship would move close to the speed of light, causing time dilation which would make time on the spacecraft move slower compared to that on Earth. However, earth's age would have passed as many light years as the journey.

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.

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