VentureStar seemed to make a bit of progress before being cancelled in 2001. Did any of the technology developed for this program lead anywhere? For example, its aerospike engines or high-tech fuel tanks?

It seems that pretty much all rocket technology after then didn't deviate too far from previous generations.

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    $\begingroup$ Down a giant rat hole. $\endgroup$ – Mark Adler Dec 3 '13 at 2:26

Many lessons learned from that activity are being applied to ongoing composite tank work at NASA.

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