{"id":"S87002887","label":"Solar sails","description":"Here are entered works about very large lightweight reflective surfaces on spacecraft for propulsion by pressure of sunlight.","source_url":"https://id.loc.gov/authorities/subjects/sh87002887","normalized_label":"solar sails","broader":["http://id.loc.gov/authorities/subjects/sh85126001"],"aliases":["Photon sails","Sails, Photon","Sails, Solar"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh87002887","provider":"lcsh","revision":"afbbc0658b4f5d8a","taxonomy_revision":"f050b5d4780b1289","title":"Solar sails","url":"/topics/S87002887","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"4633302691911976448","address_version":"morton4x16-v1","coordinates":[0,20,48700,7168],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}