Question 181992
Profound!
Andromeda is {{{2.5X10^6}}} light-years from earth.
The speed of light is: {{{c = 3X10^5}}}km/sec. 
One light-year is ({{{60*60*24*365 = 3.1536X10^7}}}secs) X ({{{3X10^5}}}km/sec) = {{{9.4608X10^12}}}km.
The distance to Andromeda is:
({{{2.5X10^6}}}ligh-years) X ({{{9.4608X10^12}}}km/light-year) = {{{23.652X10^18}}}km or 
{{{highlight(2.3625X10^19)}}}km.