A rocket built for traveling throughout our solar system could revolutionize travel on Earth, according to Elon Musk. Using a "BFR" flying at a max speed of 18,000 mph, he says we could fly anywhere on Earth in under an hour. Musk revealed the plan during tonight's speech at the 68th International Astronautical Congress 2017 in Adelaide, Australia, where he also showed SpaceX's plans for lunar and Mars missions. These "Earth to Earth" trips could make "most" long journeys in under half an hour and, according to Musk, have a cost per seat that is "about the same as full fare economy in an aircraft."
Overall, the concept is smaller and uses fewer engines than the Interplanetary Transport System Musk described last year, with added flexibility that makes it suitable for more tasks. The new BFR is 106 meters tall with a 9-meter diameter, down from the 122-meter height and 17-meter diameter described last year. The booster rocket uses 31 Raptor engines (down from 42), and there are six Raptor engines on the spacecraft itself (down from nine). Those changes also make it cheaper, which helps answer the other question left open from last year -- how would SpaceX pay for this? The master plan is to build up enough of the company's previous rockets to store a backlog, then turn its capabilities fully to the BFR and only build one rocket for all applications.
The BFR will have space for 150 tons of cargo, compared to Falcon Heavy's 30 tons, and will still be fully reusable. Its nose is big enough, Musk said, to launch a mirror that has ten times the surface area of current Hubble telescope without folding it at all, or to go around scooping up out of service satellites. With multiple engines, its built to be as reliable as an airplane, capable of landing even if it loses an engine, unlike the current Falcon 9, and is so precise that it won't even need landing legs.
Those are sizable promises, but Musk and SpaceX have big plans to match for the BFR, seeing it as a cost-efficient way to change travel on Earth and beyond.