Lets say you can travel 10 times faster than light in a warp bubble. You leave for alpha centauri and arrive in .437 years, you immediately return and arrive b

Lets say you can travel 10 times faster than light in a warp bubble. You leave for alpha centauri and arrive in .437 years, you immediately return and arrive back on earth in another .437 years. A radio broadcast in that time has traveled .837 light years.