How to watch NASA slam a spacecraft into an asteroid

How to watch NASA slam a spacecraft into an asteroid

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NASA is about to intentionally slam a spacecraft the size of a vending machine into a space rock the size of a great Egyptian pyramid. 

Incredibly, you can watch this unprecedented Sept. 26 event live.

The mission is called DART, or Double Asteroid Redirection Test, and it's humanity's first-ever attempt to purposefully...

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