Here’s the text: The Milky Way galaxy is immense. It is so large that it is hard to describe. Knowing that it measures 100,000 light-years across gives the size a number, but does not really describe the scale. One way to imagine it’s size is to compare the Milky Way galaxy to our solar system. When numbers of very different sizes are compared, the difference in size can be described using the term order of magnitude. If there is one-order-or-magnitude difference, one measurement is 10x larger as the other if there is a two-orders-of-magnitude difference, the larger number is 10 x 10, or 100, times as large.