what is the {sourcing circumstances} for {observable universe} has {density} as {1e-27} ?
Explain why our universe has a density of 1e-27:
What causes our universe to have a density of 1e-27?
SELECT ?m WHERE { resource:observable_universe property:density ?y . ?y property:density ?i . FILTER ( ?i = 1e-27 ) . ?y property:sourcing_circumstances ?m }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q221392> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2054> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <1e-27> .
?statement <http://www.wikidata.org/entity/P1480> ?value. 
} 

SELECT ?value WHERE { wd:Q221392 p:P2054 ?s . ?s ps:P2054 ?x filter(contains(?x , '1e-27')) . ?s pq:P1480 ?value}