SpaceX Iridium Next
Photo shows the empty upper stage of the SpaceX Falcon 9 mission that carried 10 Iridium Next satellites to low Earth orbit on Dec. 22.

SpaceX closed out its most successful year to date Dec. 22 with the launch of 10 satellites for mobile satellite services operator Iridium, notching a personal best of 18 launches in a single year.

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Caleb Henry is a former SpaceNews staff writer.