SpaceX on Wednesday morning launched three next-generation radar satellites for the Canadian government from California’s Vandenberg Air Force Base.A two-stage Falcon 9 rocket launched the Radarsat Constellation Mission and the previously used first stage was expected to return to Vandenberg’s Landing Zone 4 several minutes after liftoff.

In March, that booster helped send SpaceX’s Crew Dragon capsule toward the International Space Station.

The three Earth observation satellites launched Wednesday will gather data for a variety of uses, primarily for maritime surveillance, disaster management and ecosystem monitoring, according to the Canadian Space Agency.

The Radarsat program scans our planet in radio-wavelength light.Two RCM satellites have made it to Earth orbit so far: Radarsat-1 operated from 1995 through 2013, and Radarsat-2 launched in December 2007.

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