Falcon 9 Iridium-1 launch
A SpaceX Falcon 9 lifts off from Vandenberg Air Force Base, California, carrying 10 Iridium Next satellites.

Iridium Communications says SpaceX has pushed back the launch of its second batch of next-generation satellites from mid-April to mid-June, a move that shifts the expected completion date for Iridium Next to the middle of 2018.

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Caleb Henry is a former SpaceNews staff writer.