About: http://webisa.webdatacommons.org/352205237

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	You investigate why the three great eras of cosmic history???radiation, matter, and dark energy???have three characteristic kinds of expansion.
http://www.w3.org/ns/prov#wasQuotedFrom	thegreatcourses.com