what is the number of astronomical discovery techniques used in discovering the planet alpha centauri bb?
Value
1
class entity
astronomy.astronomical_discovery_technique m.0n8zk5c
astronomy.astronomical_discovery_technique base.exoplanetology.exoplanet
Astronomical Discovery Technique Alpha Centauri Bb
count none
astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method
Astronomical discoveries by this method
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 (COUNT(?x0) AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :astronomy.astronomical_discovery_technique . 
VALUES ?x1 { :m.0n8zk5c } 
?x0 :astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(COUNT (AND astronomy.astronomical_discovery_technique (JOIN astronomy.astronomical_discovery_technique.astronomical_discoveries_by_this_method m.0n8zk5c)))