The most authoritative answer in 2024
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Oliver Davis——Works at the International Civil Aviation Organization, Lives in Montreal, Canada.
It would take
100,000 years to cross the Milky Way at the speed of light but it is impossible to reach that speed. If someone could travel at 99% the speed of light it would take
about 101,000 years on earth to watch that travel but for the person on the spaceship it will last only
14,000 years.
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