When measuring distance in space between stars, galaxies and other astronomical objects, the standard unit of measure is light year (9.4607 X 1012 kilometers or 9.4607 trillion kilometers) or pc (3.26 light years), which are a massive numbers.
 
   The galaxies are scattered in space in the universe and distance between galaxies or stars easily span very large numbers as listed below and generally mentioned as 100 Septillion miles etc. for common audience.

 Large Number Designation
 Lakh*  105 = 100000 (100 thousand)  
 Million   106 = 1000000  
 Crore*   107 = 10000000 (10 Million)  
 Billion   109 = 1000000000 (1000 Million)  
 Trillion   1012 = 1000000000000  
 Quadrillion   1015 = 1000000000000000  
 Quintillion   1018 = 1000000000000000000  
 Sextillion   1021 = 1000000000000000000000  
 Septillion   1024 = 1000000000000000000000000  
 Octillion   1027 = 1000000000000000000000000000  
 Nonillion   1030 = 1000000000000000000000000000000  
 Decillion   1033 = 1000000000000000000000000000000000  
 Undecillion   1036 = 1000000000000000000000000000000000000  
 Duodecillion   1039 = 1000000000000000000000000000000000000000  
 Tredecillion   1042 = 1000000000000000000000000000000000000000000  
 Quattuordecillion   1045 = 1000000000000000000000000000000000000000000000  
 Quindecillion   1048 = 1000000000000000000000000000000000000000000000000  
 Sexdecillion   1051 = 1000000000000000000000000000000000000000000000000000  
 Septendecillion   1054 = 1000000000000000000000000000000000000000000000000000000  
 Octodecillion   1057 = 1000000000000000000000000000000000000000000000000000000000  
 Novemdecillion   1060 = 1000000000000000000000000000000000000000000000000000000000000  
 Vigintillion   1063 = 1000000000000000000000000000000000000000000000000000000000000000  
 Centillion   10303 = 1 followed by 303 zeros  
 * Used in India and neighboring Asian Countries

   [1]  Reference - Mathworld

   [2]  Astronomy Reference

   [3]  SI Unit/Factors Reference

   [4]  Math Reference

Last Revised on: November 17th, 2019