Footnote
a To put that giant number in perspective, think about this: To drive that distance by car—even speeding along at 100 miles (160 km/hr) per hour, 24 hours a day—would take you over a hundred years!
a To put that giant number in perspective, think about this: To drive that distance by car—even speeding along at 100 miles (160 km/hr) per hour, 24 hours a day—would take you over a hundred years!