<http://schema.org/about>
"A phenomenon called the Zodiacal Light, made from tiny solar system dust particles, can only be sighted under the best conditions."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/rare-zodiacal-light-will-be-visible-in-night-sky-soon>