Matches in DBpedia 2014 for { ?s ?p <http://dbpedia.org/resource/Category:Planetary_defense> . }
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- Asteroid_impact_avoidance subject Category:Planetary_defense.
- Gravity_tractor subject Category:Planetary_defense.
- Ion_Beam_Shepherd subject Category:Planetary_defense.
- List_of_Earth-crossing_minor_planets subject Category:Planetary_defense.
- List_of_asteroid_close_approaches_to_Earth subject Category:Planetary_defense.
- NEAR_Shoemaker subject Category:Planetary_defense.
- Near-Earth_object subject Category:Planetary_defense.
- OSIRIS-REx subject Category:Planetary_defense.
- Palermo_Technical_Impact_Hazard_Scale subject Category:Planetary_defense.
- Sentry_(monitoring_system) subject Category:Planetary_defense.
- Torino_Scale subject Category:Planetary_defense.
- Category:Alien_invasions_in_fiction broader Category:Planetary_defense.
- Category:Missions_to_asteroids broader Category:Planetary_defense.
- Category:Missions_to_comets broader Category:Planetary_defense.
- Category:Near-Earth_object_tracking broader Category:Planetary_defense.
- Category:Planetary_defense_organizations broader Category:Planetary_defense.