"Glory" Line Puzzle

 

"Find the Story Line" Puzzle

WLB  AMY  APCY  PA  ALLF  N  IYNC LT  ZPVMA  AL  HBLJJ N  GYSABLG,  AMYGYYXZY  JNA  CLAPLGZYJJ PG  JENHY.

Substitute the letter R for B, but not B for R.

ANSWER

FOR THE TIME IT TOOK A BEAM OF LIGHT TO CROSS A NEUTRON, THE NEEDLE SAT MOTIONLESS IN SPACE.