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