Where is everybody?

As many stars as there are in our galaxy (100 – 400 billion), there are roughly an equal number of galaxies in the observable universe—so for every star in the colossal Milky Way, there’s a whole galaxy out there. All together, that comes out to the typically quoted range of between 10²² and 10²⁴ total stars, which means that for every grain of sand on Earth, there are 10,000 stars out there.

http://waitbutwhy.com/2014/05/fermi-paradox.html