1 light - year is about 9 , 4 6 1 , 0 0 0 , 0...
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lightyear is about km that's x 2 km Imagine that a spacecraft is launched from Earth to take humans to a newly discovered Earthlike planet that is lightyears away. How fast would the spacecraft have to travel in kmhr in order to reach the planet in years?
Related Book For
University Physics with Modern Physics
ISBN: 978-0321696861
13th edition
Authors: Hugh D. Young, Roger A. Freedman, A. Lewis Ford
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