Why do astronomers use scientific notation to describe sizes?
Please see below.
Astronomers use scientific notation to describe sizes as sizes very a lot. For example, distance to moon is
Now compare it with the nearest star Proxima Centauri, which is at a distance of four light-years and as in one year there are about
This is still very small as compared to size of universe. For example, the bulge at the center of milky way is about
Further the observable universe spans some
A similar scale may apply to volumes, mass and number of stellar objects. It is for these reasons that astronomers use scientific notation to describe sizes.