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Shuttle to deliver giant window Cloud forces shuttle launch delay
(about 18 hours later)
The US shuttle Endeavour is preparing to lift off from the Kennedy Space Center in Florida. Low cloud at the Kennedy Space Center in Florida has prevented the shuttle Endeavour from launching on its latest mission to the space station.
The pre-dawn launch on Sunday will be the last time the orbiter climbs into dark skies. Nasa officials stood the orbiter down with under 10 minutes left on the countdown clock.
Just five shuttle flights remain before the re-useable fleet is retired at the end of the year. Endeavour encountered no technical issues as it prepared to lift off and will try again on Monday morning.
The mission to the International Space Station (ISS) will deliver a connecting unit and a large bay window that will be used as a robotic control room. It will be delivering a connecting unit and a large bay window to the international orbiting platform.
The launch is timed for 0439 local time (0939 GMT). Weather forecasters say there is an 80% chance of favourable conditions. The shuttle mission is the first since President Barack Obama announced a new vision for US human space exploration.
The shuttle mission is the first since President Barack Obama announced a new vision for US space exploration.
Last Monday, he cancelled the rockets and capsule Nasa was developing to replace the shuttle, and urged the commercial sector to provide future transport needs.Last Monday, he cancelled the rockets and capsule Nasa was developing to replace the shuttle, and urged the commercial sector to provide future transport needs.
NODE 3 - 'TRANQUILITY' Key unit connects and helps manage other ISS modulesMultiple docking ports for visiting vehicles or future modules7m by 4.6m; a mass of 14 tonnes, but will be fitted out in orbitSophisticated life support systems will include air cleaning unitCupola to be fixed to an Earth-facing port once in orbitPanoramic views provide ideal control room for robotic armNamed after Sea of Tranquility, the Apollo 11 landing siteNODE 3 - 'TRANQUILITY' Key unit connects and helps manage other ISS modulesMultiple docking ports for visiting vehicles or future modules7m by 4.6m; a mass of 14 tonnes, but will be fitted out in orbitSophisticated life support systems will include air cleaning unitCupola to be fixed to an Earth-facing port once in orbitPanoramic views provide ideal control room for robotic armNamed after Sea of Tranquility, the Apollo 11 landing site
Endeavour's mission, which includes three spacewalks, will end construction on the Western part of the space station. Sunday's launch was postponed because the thick layer of cloud which moved in over Kennedy would have prevented launch officials from following visually the progress of the ascent, but also because the cloud would have hampered the safe return of the shuttle to Kennedy were it to encounter a problem and need to abort its flight.
Once installed, the Node 3 and Cupola modules will make the platform 90% complete. The head of the US space agency, Charlie Bolden, was in attendance at Kennedy.Speaking to reporters, he conceded Mr Obama's new path was causing anxiety among Nasa workers and in Congress.
The mission is an important moment for the European Space Agency's (Esa) contribution to the ISS project. "This is going to be complex and complicated, and we've got to work all this stuff out," he said.
Both modules being ferried to orbit were constructed in Italy by Thales Alenia Space. Endeavour's 13-day mission, which includes three spacewalks, will be the last night launch for a shuttle. The four missions that follow Endeavour will all take place in daylight hours.
Their production concludes a barter arrangement made between Esa and Nasa in which Europe agreed to supply significant components for the platform in return for a free trip into space for its Columbus science laboratory and supporting equipment. Once installed on station, the Node 3 and Cupola modules will make the platform 90% complete.
Some 7m in length and about 4.5m in width, Node 3 is built around the same design principles as Europe's other space station contributions. The mission is an important moment for the European Space Agency's (Esa) contribution to the ISS project. Both modules being ferried to orbit were constructed in Italy by Thales Alenia Space.
Columbus, Node 2, the ATV space freighter, and the Multi-Purpose Logistics Modules (which serve as the packing boxes for major re-supply missions carried out by the US shuttle) all have a similar cylindrical look about them. Node 3 connecting unit will house the station's core life-support systems.
Node 3 has several bays inside its multi-layer, meteoroid impact-hardened shell.
These bays will quickly become filled in orbit by equipment already on the station.
Chief among these will be the Environmental Control and Life Support Systems (ECLSS).
Their jobs involve scrubbing the air of carbon dioxide to maintain its oxygen concentration; and recycling waste water, including urine, so it can be drunk again and again.
Node 3 will also store a treadmill the crew will need to use regularly to exercise their bodies and maintain bone density.
The node has several berthing ports that could conceivably even allow the ISS to be expanded one day.The node has several berthing ports that could conceivably even allow the ISS to be expanded one day.
"Node 3 is an interconnecting module," explained Simonetta Di Pippo, Esa's director of human spaceflight."Node 3 is an interconnecting module," explained Simonetta Di Pippo, Esa's director of human spaceflight.
"It's a door open to the future, because if we decide to develop new modules, new extensions, new capabilities, we will be able to do it because we are now launching Node 3.""It's a door open to the future, because if we decide to develop new modules, new extensions, new capabilities, we will be able to do it because we are now launching Node 3."
The Cupola is a dome-shaped module with seven windows. At 80cm in diameter, its top window will be the biggest ever flown in space. The Cupola is a dome-shaped module with seven windows. At 80cm (31.5in) in diameter, its top window will be the biggest ever flown in space.
UK-born astronaut Nicholas Patrick will perform three spacewalks
The module will act as a control room to direct robotic operations on the exterior of the platform, and provide a vantage point for the astronauts to view their home planet.The module will act as a control room to direct robotic operations on the exterior of the platform, and provide a vantage point for the astronauts to view their home planet.
The UK-born American astronaut Nicholas Patrick will be one of the spacewalkers who will help install the modules.
"I will be undoing the bolts that hold the Cupola shutters down," he said.
"Once those 21 bolts are released, one of my colleagues on the inside can open up the window shutters and take a first look out through the Cupola windows, which will be, I think, just a fantastic thing on the space station," he told BBC News.
This will be the 130th space shuttle flight, the 24th flight for shuttle Endeavour and the 32nd flight to the station.
Nasa hopes to run out the final four shuttle flights before the end of the year, although President Obama has promised the agency funding to support the schedule should it slip into 2011.
Jonathan.Amos-INTERNET@bbc.co.ukJonathan.Amos-INTERNET@bbc.co.uk