Word FormationExercise 78 of 110

The speed of light is often noted as 186,000 miles per second, but the most accurate and modern accepted (0) MEASUREMENT (MEASURE) puts it at 299,792,458 km per second, which is (1) .......... (SLIGHT) more than 186,000 miles per second. The first measurements within one per cent of the finally agreed-on figure were…