The American entrepreneur Elon Musk has given a further update on his Starship and Super Heavy rocket system.
He plans to use the new vehicles to send people to the Moon and Mars, and also to move them swiftly around the Earth.
The SpaceX CEO is in the process of building prototypes and plans to start flying them in the coming months.
The Mk1 version of his Starship would begin high-altitude tests in the next one to two months, he said.
"This is the most inspiring thing I've ever seen," the entrepreneur told an audience gathered at the company's Boca Chica, Texas, facility where the prototype has been assembled.
"So this thing is going to take off, fly to 65,000ft, about 20km, and come back and land. So that giant thing, it's really going be pretty epic to see that thing take off and come back."
The 50m-tall Starship will eventually fly atop its booster, the Super Heavy.
A first test flight of this booster, carrying a Mk3 Starship, could go to orbit as early as next year, Mr Musk said.
"This is going to sound totally nuts, but I think we wanna try to reach orbit in less than six months. Provided the rate of design improvement and manufacturing improvement continues to be exponential, I think that is accurate to within a few months."
Both parts of the new rocket system, which together will stand 118m tall on the launch pad, are being designed to be fully reusable, making propulsive landings at the end of their mission.