The next generation of SpaceX’s Starship rockets will be taller than the Great Pyramids of Giza, Elon Musk has said. The SpaceX boss is currently preparing for the next Starship test flight, which is set to take place this month, but is already looking ahead to future versions of the craft that he hopes will one day transport people to Mars.

It’s the first flight of Boeing’s Starliner capsule with a crew on board, a pair of NASA pilots who will check out the spacecraft during the test drive and a weeklong stay at the space station.

Boeing’s Starliner project has suffered years of setbacks and hopes to compete with Elon Musk’s SpaceX carrying NASA astronauts to the International Space Station.