Join us on a captivating adventure through the vastness of the cosmos as we traverse the sizes and scales of what lies around us in space ... of stars and non-stellar gasses, and of the maps of ...

These grids help us to locate features on the map. Maps include a scale to help us work out distance between points on a map. Scale is usually written on a map as a ratio. For example 1:25000.

But, how big is it, exactly? This animated map shows the scale of the Mississippi River and its drainage system in perspective. Follow Tech Insider: On Facebook More from Tech The Mississippi ...