About: http://webisa.webdatacommons.org/356708632

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	Deuterium lasts, tritium has a half-life of 12.5 years, so it is long-gone.But do _not_ confuse the density of the nebula with the mass or the atmosphere of Earth and other planets.
http://www.w3.org/ns/prov#wasQuotedFrom	slashdot.org