<ul><li>The US government's secretive X-37B space plane has returned to Earth after a 434-day mission.</li><li>The recent flight is being hailed as the start of an exciting new chapter in the X-37B program.</li><li>During the mission, the space plane performed successful aerobraking maneuvers to change its altitude.</li><li>The X-37B's primary goal is to advance reusable spacecraft technology through conducting various experiments in orbit.</li></ul>

Top-secret X-37B space plane returns to Earth in dead of night after mysterious 434-day mission, US military reveals

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