Physics, 08.08.2019 23:20, paatnguyyen

Two stars have proper motions of one arcsecond per year. star a is 20 light-years from earth, and star b is 10 light-years away from earth. which one has the faster velocity in space?

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Two stars have proper motions of one arcsecond per year. star a is 20 light-years from earth, and st...