## Number of Stars in the Universe

**How many stars are there in the universe?**

**9 sextillion.**

The number of stars in the observable universe is estimated to be 9 x 10^{21} or 9 billion trillion or 9 sextillion. This estimate is derived from the volume of the observable universe and stellar density that is calculated based on observations from the Hubble Space Telescope.

This fact is verified on : February 3, 2010.