https://phys.org/news/2018-07-spacex-iridium-satellites.html > It was the seventh launch in Iridium's $3 billion campaign to replace its entire fleet of globe-circling satellites and brought the number in orbit to 65. One more launch will increase the number to 75, including 66 operational satellites and nine spares. > SpaceX says that despite challenging weather and sea conditions, the Falcon's first stage successfully returned to Earth and landed on a "droneship" stationed in the Pacific Ocean south of Vandenberg. Explore further: SpaceX set to launch satellites from California air base