SpaceX's repurposed Crew Dragon capsule docked to the International Space Station on Saturday.

The capsule containing four astronauts was launched on Friday from the Kennedy Space Center in the US state of Florida.

The capsule was successfully docked on Saturday morning to the ISS, which at the time was flying some 420 kilometers above the Indian Ocean.

The four astronauts aboard the capsule - Shane Kimbrough, Megan McArthur, Akihiko Hoshide and Thomas Pesquet - will spend the next six months on the space station conducting scientific experiments.

They replace four other astronauts.

It is the first time that two Crew Dragon capsules have been docked at the ISS.

The four astronauts who will be replaced will return to Earth on Wednesday in their own capsule.

It is the third time that SpaceX has brought astronauts to the space station.

It is the first time that the company has reused a Crew Dragon capsule for this.

See also: These are the highlights of space company SpaceX in recent years

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SpaceX sends four astronauts to ISS in recycled capsule