<p>Former NASA astronaut Ed Lu used to worry about asteroids crashing into earth. Now, he’s turned his attention to an even more pressing problem – the weaponization of space debris — and officials say it may have already happened.</p>

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Former NASA astronaut Ed Lu used to worry about asteroids crashing into earth. Now, he’s turned his attention to an even more pressing problem – the weaponization of space debris — and officials say it may have already happened.

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