Blue Origin, the private space company founded by the chief executive of Amazon.com, Jeff Bezos, launched an unmanned spaceship in its first test flight. Mr. Bezos said in a statement that the spacecraft, called the New Shepard capsule, reached 58 miles high and parachuted to a landing in the West Texas desert. The rocket booster developed a pressure problem and couldn’t be recovered. Blue Origin, which is vying to send people on suborbital trips, released video and photos of the flight. The company’s website says New Shepard, which can carry at least three people, aims to eventually fly over 62 miles above Earth, the recognized boundary of space.