###### Example 6.7.7 Multiplying and Dividing Using Scientific Notation

The fastest spacecraft so far have traveled about \(5\times10^6\) miles per day.

If that spacecraft traveled at that same speed for \(2\times10^4\) days (which is about \(55\) years), how far would it have gone? Write your answer in scientific notation.

The nearest star to Earth, besides the Sun, is Proxima Centauri, about \(2.5\times10^{13}\) miles from Earth. How many days would you have to fly in that spacecraft at top speed to reach Proxima Centauri