2 ms·

I assume that this at very least tests reliability of the deorbiting and landing systems.

• lowbloodsugar 4y ago
  Not very often, if it's been in space for 770 days.
  • bergenty 4y ago
    They’re sure testing longevity well.
    • ncmncm 4y ago
      Longevity is the least interesting quality of a re-usable spacecraft. We have six decades' experience keeping spacecraft on long orbital, and even trans-planetary, flights working. If testing longevity is any significant use of X-37B, that is another way of saying it is useless.