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A comment on SpaceX successfully launches and lands a used rocket for the second time. Parent comment

Re:SpaceX successfully launches and lands a used rocket for ... by blastofpast on Friday June 23, 2017 @04:52PM (#14622690)
Ah, I believe I understand now. Here's an older tweet from Musk which mostly explains it: "Crush core is aluminum honeycomb for energy absorption in the telescoping actuator. Easy to replace (if Falcon makes it back to port)."
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Re:SpaceX successfully launches and lands a used rocket for ... by greglindahl on Friday June 23, 2017 @08:32PM (#14623748)
This was a hot enough landing that they used a 3-engine hover-slam to reduce fuel usage. Their last attempt at a 3-engine landing burn was also their last landing failure. When a landing goes slightly wrong, the crush core is the first thing to go... and this time it successfully did its job.
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