<http://schema.org/alternativeHeadline>
"The Ring Nebula is just over 2,000 light-years from Earth in the Lyra constellation and is 1 light-year wide."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/hubble-telescope-reveals-true-shape-of-ring-nebula>