Question: 1 light - year is about 9 , 4 6 1 , 0 0 0 , 0 0 0 , 0 0 0 km -

1 light-year is about 9,461,000,000,000 km -- that's 9.461 x 10122 km. Imagine that a spacecraft is launched from Earth to take humans to a newly discovered Earth-like planet that is 5.7 light-years away. How fast would the spacecraft have to travel (in km/hr) in order to reach the planet in 100 years?

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