SpaceX halts Starship launch at last minute

- Elon Musk's company SpaceX postpones the debut launch of the most powerful rocket ever built
- The entrepreneur says a frozen valve meant the giant rocket could not take off as planned, but they will try again in a few days
- The vehicle is being put to the test in the belief it could eventually usher in an era of interplanetary travel
- Thousands of people had gathered on beaches along the Gulf of Mexico hoping to witness the spectacle
- When it does eventually take off, the planned test flight should fly most of the way around the Earth and splash down in Hawaii
- Ahead of the launch Musk said he wanted to lower expectations, and said afterwards that the team had learned a lot read more