<http://schema.org/about>
"The supernova remnant is about 1,000 years old as seen from Earth, and it is located about 26,000 light-years away."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/rare-star-explosion-creates-galaxys-youngest-black-hole>