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This is only a test – of planetary defense. Today, our #DARTMission is set to crash into a non-hazardous asteroid to test deflection technology, should we ever discover a threat. Impact: 7:14pm ET (23:14 UTC). Watch our LIVE broadcast at 6pm E

One hour until the 6pm ET live broadcast for #DARTMission’s impact into an asteroid! The autonomous system on the spacecraft is operating on its own as DART approaches with no human intervention. Tune in to watch the impact live from mission co