What Time Is It?
In the year 2100, a family went out into space for a vacation exactly one light-minute away from home. They used an advanced telescope to look at their clock. The child, Sam, was so exact at time. If it's 9:59, he stays up one minute until ten. One night, Sam looked through the telescope and saw the clock showed 9:59. But his dad said it was ten and he had to go to sleep. How is that possible?
The clock back at home was their ONLY time source.
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