Blue Origin referred to NASA's decision to grant the $2.9 billion lunar contract exclusively to SpaceX as 'inconsistent and unfair' in a separate statement.
Online bidding for the coveted inaugural spot aboard Blue Origin's New Shepard will continue until June 19, when it will shift to a live online auction.
Amazon CEO Jeff Bezos, who heads up his own spaceflight company called Blue Origin, congratulated Musk and the rest of the SpaceX team for the Starship test flight.