Τον περασμένο Αύγουστο η Lockheed Martin, η Πολεμική Αεροπορία, και DARPA δοκίμασαν το Όχημα Υπερηχητικής Τεχνολογίας (HTV-2), η οποίο ταξίδεψε με ταχύτητα 20 φορές μεγαλύτερη
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