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rtlt
'rtlt' - used as a noun
1. the elapsed time it takes for a signal to travel from Earth to a spacecraft (or other body) and back to the starting point
Variations of 'rtlt'
 
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To be idle is a short road to death and to be diligent is a way of life; foolish people are idle, wise people are diligent. - Click here to find out.
Fact of the day
Apples are part of the rose family