https://w3id.org/framester/conceptnet5/data/en/planetary_nebula.n <https://w3id.org/framester/conceptnet5/schema/RelatedTo> <https://w3id.org/framester/conceptnet5/data/en/nova_remnant> <https://w3id.org/framester/conceptnet5/data/en/supernova_remnant> <https://w3id.org/framester/conceptnet5/data/en/nebulosity> <https://w3id.org/framester/conceptnet5/schema/Synonym> <https://w3id.org/framester/conceptnet5/data/en/pn> risorse dalla linked data cloud