5 *10^9 years 100 m ------------------- = -------------- 5 * 10^3 yrs x
Reducing the first fraction,
100 m 10^6 = ---------- x 100 m Solving for x, x = ------------- = 10^(-4) m, or [10^(-1)] * [10^(-3))] 10^6 this comes out to one tenth of 1 millimeter.
