Four astronauts from four countries blast off for International Space Station

The SpaceX Falcon 9 rocket with the Crew Dragon spacecraft blasted off from pad 39A at Kennedy Space Centre in Cape Canaveral (AP)

Four astronauts from four different countries have blasted off for the International Space Station.

They should reach the orbiting lab in their SpaceX capsule on Sunday, replacing four astronauts who have been living up there since March.