<http://schema.org/alternativeHeadline>
"If you're still around in about 4 billion years, don't worry about the collision: It poses no real danger of destroying Earth or the solar system."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/milky-way-andromeda-galaxies-doomed-to-collide-head-on>