if the universe were shrunk to the size, of earth, how large would the earth be on this scale?

Explanation

Here, size of universe `~= 10^(25)m`
`"size of earth" ~= 10^7m`
`"Magnification"m = ("size of earth")/("size of universe")`
`=(10^7)/(10^(25)) = 10^(-18)`
`:. "Apparent size of earth" = mxx "actual size"`
`= 10^(-18)xx10^7`
`=10^(-11)m`