About: http://webisa.webdatacommons.org/303346250

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	This is due to a spiral density wave that sweeps around the plane of the galaxy, compressing the material in its path including clouds of dust and gas.
http://www.w3.org/ns/prov#wasQuotedFrom	atnf.csiro.au