Convert from petameter to span

Unit Definition (petameter)
The petameter is a metric unit of distance equal to 10E12 kilometers. This is equivalent to about 621.371 billion miles or 0.1057 light year. The distance from the earth to the nearest star (other than the sun) is about 40 petameters.

Unit Definition (span)
Span is the width of a human hand, from the tip of the thumb to the tip of the pinky finger.