<http://schema.org/alternativeHeadline>
"Taking a glance at both Venus and the moon in the sky, you may think that Venus is the brighter of the two, but it's actually the moon."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/venus-moon-to-offer-friday-morning-treat>