Matches in DBpedia 2015-10 for { ?s ?p "Major contributors to space debris include the explosion of upper stages and satellite collisions.There were 190 known satellite breakups between 1961 and 2006. By 2015, the total had grown to 250 on-orbit fragmentation events.There is estimated to be 500,000 pieces of debris in orbit as of 2012, with 300,000 pieces below 2000 km (LEO). Of the total, about 20,000 are tracked."@en }
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- List_of_space_debris_producing_events comment "Major contributors to space debris include the explosion of upper stages and satellite collisions.There were 190 known satellite breakups between 1961 and 2006. By 2015, the total had grown to 250 on-orbit fragmentation events.There is estimated to be 500,000 pieces of debris in orbit as of 2012, with 300,000 pieces below 2000 km (LEO). Of the total, about 20,000 are tracked.".