supernova remnants is the category of what celestial object?
Entity Entity Entity
m.07589 m.02wwxpb m.03wdhww
SN 1987A RX J0852.0-4622 G292.0+01.8
class entity
astronomy.celestial_object m.09wrk
astronomy.celestial_object astronomy.celestial_object_category
Celestial Object supernova remnants
none none
astronomy.celestial_object.category
Category
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :astronomy.celestial_object . 
VALUES ?x1 { :m.09wrk } 
?x0 :astronomy.celestial_object.category ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND astronomy.celestial_object (JOIN astronomy.celestial_object.category m.09wrk))