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Complete video at: A group of scientists discuss the growing international concern of space junk and debris originating from colliding satellites. ----- IDEAS THAT ACCELERATE: SCIENCE MULTIPLIERS Why Space Matters Ariane Cornell, Executive Director, Space Generation Advisory Council, United Nations Clayton Mowry, President, Arianespace Mark Sirangelo, Executive Vice President, Sierra Nevada Corporation Doug Comstock, Director of the Innovative Partnerships Program, NASA Moderator: Ira Flatow, Science Friday, NPR Compass Summit, a forum for true interaction and exchange, examines some of today's most pressing problems through the lens of global citizenship, recognizing that human ingenuity is an unlimited resource. Guided by NPR's Ira Flatow, an intimate group of some of the world's best thinkers and doers convened along the rugged Palos Verdes coastline on Oct 23-26, 2011 at Terranea Resort to engage in meaningful conversation, ask questions, and challenge ideas -- we invite you to join in the conversation.