The US military's X-37B robot spaceplane blasted off from Florida on its seventh mission, the first launched atop a SpaceX Falcon Heavy rocket capable of delivering it to a higher orbit than ever before. Subscribe to Guardian News on YouTube ► The launch of the plane, which will carry out classified experiments, marks another development in US-China space rivalry. The Guardian publishes independent journalism, made possible by supporters. Contribute to The Guardian today ► Sign up to the Guardian's free new daily newsletter, First Edition ► Website ► Facebook ► Twitter ► Instagram ► The Guardian on YouTube: The Guardian ► Guardian Australia ► https://b
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