Total number of stars
3 X 1023 are the possible number of stars in the universe ! ( a number equivalent to the total number of human cells, as mentioned by Conroy) (source, based on Pieter G. van Dokkum & Charlie Conroy, 2010, Nature, 468,940–942)
Useful astronomical numbers
Just some useful numbers and units to remember and to have an easy access to! [last updated: 29 Dec 2011] >> Distance 1 AU = 150 x 106 km 1 pc = 3.09 × 1013 km = 206260 AU = 3.26 ly 1 ly = 9.4 x 1012 km = …