2011年4月6日星期三

NASA human space flight program lost in transition

US space agency is the budget deadlock rings with competing visions and uncertainty.Click for information about NASA PlansNASA

NASA should be revived "not only with US dollars, but with clear objectives and a larger purpose", President Barack Obama said U.S. in April, after the removal of the previous Government of under-resourced constellation program rockets and capsules for human space flight. But 12 months later, money and clarity are in short supply at the Agency, which is paralyzed by a budget showdown and buffeted by conflicting messages from Obama and the US Congress on the next steps in human space flight is (see "space wars").

Bring this week may take 2011, overdue now more than six months finally some relief on the tax front - if Congress, a budget. That would free 2010 NASA requirements, from his ongoing budget, which prevented the launch of new projects or final funding for constellation. But a larger debate remains about what built rockets, unresolved, replace the venerable space shuttle make due to its last flight on 29 April.

"I spent more than 40 years closely monitoring the US space programme, and I have never seen how confused, as it is now,", says John Logsdon, former Director of the space policy Institute at George Washington University in Washington DC. "It is simply a mess."

Constellation was the target of the Bush era program, to develop rockets and capsules, which could replace the shuttle and the astronauts on low Earth orbit to the Moon and eventually Mars. In technologies for trips outside Earth's orbit, cancel it, Obama called for increased spending for new rocket extended to the end date of the international space station (ISS) from 2015 to 2020 and invests in private space company orbit ferry and supplies at low Earth crew.

The plan failed, Congress, particularly those members impress bring for regions which benefit from the federal dollar NASA contracts. It appears "has lost thousands of jobs" and "cast fear and doubt" in the entire space industry, said Ralph Hall (Republican, Texas), Chairman of the House Committee on Science, space and technology, during a House Subcommittee hearing on human space exploration on 30 March. Other legislators warn that the Obama is a proposal to buy an invitation to delay and perhaps disaster space transportation services by private contractors.

In September 2010 offered Congress a proposal, part of constellation under a different name revive. In authorization bill - the provided direction but no money - it tells NASA of a multi-purpose crew vehicle (MPCV) and a heavy lift launch system with similar specifications of constellation Orion crew capsule and Ares V rocket to produce. Start the new rocket, by 2016, should be the astronauts of low Earth orbit. The law calls for NASA to avoid continue to so many orders of constellation, which would have raised Obama's plan as possible on the US$ 2.5 billion in termination fees. Total budget of the plan comes in around $1 billion lower than projected for constellation.

Obama signed the Bill in October in a law, but the debate is far from agreed upon. In his 2012 budget request, associates manage $ 850 million to aggressively promote the development of commercial space transportation - 70% more than Congress authorized. And although Obama's request, there is $2.81 billion for the work on which contains MPCV and heavy launch vehicles, the MPCV carry no target date for the start of the missile or vehicle which could in the meantime.

The Obama are administration and Congress on how large the heavy lift rocket should be. The authorization Act says that it provides 130 tons into orbit, 4.5 times more than that must be shuttle. Last month, NASA Administrator Charles Bolden told reporters that he does not believe that the 130-ton lift capability for at least ten years is required when the President calls plan for manned missions on low Earth orbit. Doug Cooke, systems, NASA Associate Administrator for exploration expands on this while the Subcommittee hearing, namely, that NASA plan officials, would a vehicle permit tonnes, to develop, which by 2016 or soon after launch the Agency with an initial capacity of orchestral drums.

In the meantime, financing remains in the balance. The last Congress has passed no budget for this year and of the intermediate examination in November elections swept a Republican majority in the House of representatives, which is bent on making drastic cuts, public spending. 2011 Blocked with the two parties on the budget, members had to a number of short-term measures choose, maintain the 2010 programs and funding levels. Constellation continues to be funded to delay work on any new initiative.

Some argue that that not wasted about $ 250 million for the constellation in the current financial year has been. Presented at the March 21 Lockheed Martin space systems, based in Denver, Colorado, such as a new simulation centre where engineers try docking maneuver with the programme Orion crew capsule. The capsule meets most requirements of the authorization bill and all indications are that it is selected as the MPCV, says Larry price, Deputy program manager for Orion. Continue to the constellation of such contracts is in the best interest of NASA, he says. He says "As you can imagine it would be extremely inefficient to stop something, redistribute the workers and it again from the beginning started - in particular, if it exactly the same".

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Although NASA eventually promised achieved the clarity, the Obama a year ago, it is many years with no possibility, send people into space. The last time the Agency had a similar gap - between the end of the Apollo program in the year 1975 and the first shuttle launch 1981 - it knew what was to come. The shuttle program had announced completion three years before the Apollo.

The current situation is much worse, said James Burr, Chairman of the Committee on corporate membership at the American Institute of Aeronautics and Astronautics during the hearing of the House Subcommittee. He said "We simply do not know, what's next,".

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