In an interview with Tasnim News Agency, Salarieh touched upon the success of Iran's biological capsule launch last year, which reached the height of 130-140 km above the earth's surface in a suborbital flight and then landed back.
The launcher part performed very well, but in the capsule part, the slow return subsystem faced problems, he said.
He added that the subsystem plays an important role in controlling the speed and safe landing of the capsule.
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