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On Tuesday, a NASA spacecraft touched down on an asteroid as it sped through space, about 320 million kilometres from the Earth, grabbing a sample of rocks dating back to the birth of the solar system to bring home. Scientists hope this will unlock the secrets of life on the Earth. Al Jazeera’s Alexi O'Brien reports. - Subscribe to our channel: http://aje.io/AJSubscribe - Follow us on Twitter: https://twitter.com/AJEnglish - Find us on Facebook: https://www.facebook.com/aljazeera - Check our website: https://www.aljazeera.com/ #NASA #OSIRISREx #ToBennuAndBack

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