About: http://webisa.webdatacommons.org/132801116

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Note also that galaxies are mostly empty space, the stars block a tiny fraction of any background source, unless it is seen nearly edge-on so that the the light path through the disc is very long.
http://www.w3.org/ns/prov#wasQuotedFrom	phys.org