<http://schema.org/alternativeHeadline>
"A new study found evidence that the star astronomer John Herschel reported seeing explode in 1842 was different than a nearby recurring nova."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/the-star-explosion-that-wasnt-astronomers-solve-150-year-old-mystery>