After the successful launch of the Falcon 9 rocket in the United States its marching step failed to return to the platform near the start.
While the Dragon capsule is now on its way to the ISS, the rocket's spent first stage rocket failed to land properly at its designated "Landing Zone 1" pad along the Cape Canaveral coast. It appeared to be undamaged and was transmitting data, Musk said, adding that a recovery ship was sent to retrieve it.
The Dragon cargo ship successfully made it to orbit, which was the primary goal of the launch.More news: MPs find ministers in contempt of Parliament
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The rocket was directed away from the coastline and out to the Atlantic Ocean, where it managed to recover from its spin just before landing safely in the water.
John Insprucker also revealed that rocket's second stage was precise. "All told, another great day for SpaceX and NASA". The main aim of the mission was a success, delivering the supplies to the orbiting space lab.
SpaceX has a contract to ferry American astronauts to the space station as part of what's known as the Commercial Crew program with NASA, but the timeline for the first flights has slipped repeatedly.
The SpaceX Falcon 9 rocket blasted off carrying the Dragon spacecraft at Cape Canaveral Wednesday. The mice and their habitat were loaded into spacecraft shortly before launch, but the spoiled food had to be replaced ahead of launch.