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While this risk could be avoided by adding independent escrow authorities as another layer in the PKI , such a solution would be costly and inefficient . Because propellant from the torn bags could theoretically become lodged in the threads of the nose cone , and the friction from unscrewing the nose cone could produce enough heat to cause the propellant to detonate and the sub-munitions to be ejected , the Union filed a grievance claiming that the employees should receive 8 percent EDP . Ames officials are looking at how the Orion exploration vehicle could be used for a human mission to an NEO , McKay explained . The interaction is simple enough so that a visitor could navigate the space and feed the birds with little instruction .