<http://schema.org/alternativeHeadline>
"Only in the last 60 years have we made progress in understanding our skies through huge powerful telescopes. Here's a look at some of the most impressive scopes in the world."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/the-worlds-most-powerful-telescopes-infographic>