Wednesday, August 25, 1999 Published at 13:23 GMT 14:23 UK
Next generation space planes are go
The X-33 can be turned around quickly (Nasa)
Flight tests are due to begin next year on a new generation of reusable spacecraft that should substantially reduce the cost of putting payloads into orbit.
Officials at Nasa, giving a status report on the experimental X craft, said a series of flight tests on three vehicles would begin in summer of 2000.
Putting a pound (454 grams) into orbit using current rockets or the space shuttle costs $5,000 to $20,000, said Nasa's Gary Payton. The new generation of space launchers would reduce this to about $1,000 a pound.
"The X-33, X-34 and X-37 will prove in flight the technologies that can remove the cost and reliability barriers to space flight. Instead of five flights in 68 days being a new world record, five flights in 21 days will be routine."
The X programme is partly funded by private industry.
Lockheed are involved in the X-33, which is designed to reach orbit using just one engine not several different stages. It is a 21-metre-long (69 ft), wedge-shaped craft that can take off vertically and then lands like an airplane after a gliding descent from orbit.
Launching from spaceports
The goal of the X-33 program is to build a spacecraft that can be launched every seven days by as few as 50 people from simple spaceports that could be located virtually anywhere. It will start a series of 15 test flights next summer.
The X-37, being built by Boeing, will be carried into orbit by the space shuttle, fly to higher orbits and then land like an airplane. About 40 technologies will be tested in two flights by the craft starting in 2002.
Nasa also has the X-38 in development, which will act as the "lifeboat" for the new International Space Station.
Shuttle launches delayed
Nasa says the dates for the next three space shuttle missions are now unknown because of time-consuming electrical safety checks. The delays mean Discovery's mission to repair the Hubble Space Telescope, due to fly 14 October, may not now go until late October or November.
There is good news from Moscow, however. The long-delayed service module for the International Space Station looks as though it will go into orbit from the Baikanor Cosmodrome on 12 November.