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The ISS does have its own defenses, of course. Fabric-y buffers envelope some of the systems, and a bumper called the Whipple Shield helps blunt impact. That shield is only built to stop debris up to about 1 cubic centimeter, though, and the debris tracker is only designed to catch pieces 10 cubic centimeters and larger. In other words, there’s a gap in defenses.

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He said he did not blame NASA's contractors for the current slow pace of Artemis launches. Instead, "we should have made better decisions (in the past) and said, you don't go from Artemis II to landing on the moon with Artemis III."

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