Of the tens of billions of trillions of stars composing the observable universe, only a very small percentage are visible to the naked eye. (britannica.com)
«Clusters of galaxies are rare regions of the Universe consisting of hundreds of galaxies containing trillions of stars, as well as hot gas and mysterious dark matter,» said the lead author, Tracy Webb of McGill University, Canada. (keckobservatory.org)
The probability may be low but in a universe with trillions of stars, there's a good chance that life also exists elsewhere. (religion.blogs.cnn.com)