FastSaying
The rocky and rough surface of the asteroid was surprising. The 16-minute light travel time [between Earth and the spacecraft] makes real-time communications very difficult.
Donald Yeomans
Earth
Time
Travel
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It takes 7 1/2 minutes for a signal to get from Earth to the spacecraft and another 7 1/2 minutes to get back. So, we can't joystick this spacecraft like a video game.
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