A sensor on one of the tanks supplying hydrogen to a fuel cell was showing unusually high pressure readings on March 13.

The malfunction occurred almost simultaneously in the systems supplying both liquid hydrogen and liquid oxygen for the shuttle's three main engines.

It is possible that natural gas could supply hydrogen for cars; even the reformation itself could take place in a car.

"We advertise publicly for tenders to supply liquid hydrogen and oxygen from suppliers."

As a result, the Air Force was able to easily supply hydrogen for weather balloons, since it was more efficient to ship liquid ammonia to distant locations than cylinders of gas.

The trouble centered on a tank supplying hydrogen to the shuttle's fuel cells, which make electricity for the spacecraft.

The sulfur-iodine cycle has been proposed as a way to supply hydrogen for a hydrogen-based economy.

"We have 180,000 gas stations in the U.S., and 30,000 to 40,000 of them would have to be equipped to supply hydrogen."

The power station that Jephtha chose was a hydrogen retrieval plant that supplied hydrogen, oxygen and electricity to all of the subcontractors in the Director's space program.

The trouble is with a tank supplying hydrogen to the shuttle's fuel cells, which make electricity for use throughout the spacecraft.