<http://schema.org/alternativeHeadline>
"The heliotail is inflated by the solar wind of particles streaming off the sun, and the four-leaf clover shape is the result of solar winds."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/our-solar-system-has-a-tail-and-its-shaped-like-a-4-leaf-clover>