<http://schema.org/about>
"The most current estimates guess that there are 100 to 200 billion galaxies in the universe, each of which has hundreds of billions of stars."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/photos/8-images-of-galaxies-far-far-away/our-own-milky-way>