By Andy Pasztor 

The international space station "continues to be the perfect role model" for cooperation between Russia and the U.S., America's top space official told a House panel Thursday, confirming that Moscow has committed to keeping the orbiting laboratory operating through 2024.

Despite various diplomatic clashes between Moscow and Washington, Charles Bolden, head of the National Aeronautics and Space Administration, told lawmakers that the two countries continue to work closely together on space station operations. Testifying before a House Science subcommittee, Mr. Bolden provided the Obama administration's most specific official statement yet indicating that Russian space authorities have pledged to support U.S. plans to maintain the space station for nearly another decade.

Kremlin officials previously indicated they backed such plans, but Russian news reports at the time were confusing and included references to Russian proposals to assemble an independent space station after 2024. NASA now relies on Russian rockets and spacecraft to transport U.S. astronauts to and from the orbiting laboratory.

The Kremlin's plans prompted renewed attention Thursday, because Russian President Vladimir Putin said that by 2023 "we plan to create our own national space station in orbit." Mr. Putin didn't elaborate during his marathon call-in session with the nation, but Russian space authorities have said they were considering dismantling parts of the existing station and using them as the core of a new Russian replacement.

On Thursday, Mr. Bolden reiterated that NASA's priorities include funding development of commercial space taxis to ferry U.S. astronauts into low earth orbit starting in 2017. "We have to get away from our reliance on the Russians," Mr. Bolden said.

But in response to repeated questions from lawmakers about potential NASA contingency plans to accelerate that shift, the NASA chief said 2017 is the earliest possible date to take over that role. Boeing Co. and Space Exploration Technologies Corp. are working on separate contracts for manned transportation systems.

The hearing was marked by continued friction between NASA and the bipartisan leaders of the panel over funding levels and timetables to develop a heavy-lift rocket and manned capsule designed to eventually take astronauts to Mars. Lacking congressional consensus for the agency's plans to move the first manned flight of the Orion capsule to 2018 from 2017, Mr. Bolden fended off criticism from members of the panel.

"America is losing ground and could arguably no longer be the pre-eminent space program," said Rep. Mo Brooks, the Alabama Republican who is vice chairman of the space and aeronautics subcommittee.

Regardless of how broader U.S.-Russian relations evolve, Mr. Bolden said, "I am going to work with my Russian partners" to maintain the space station. But at the same time, he said, NASA continues to spend on internal technical and management capabilities to ensure that "we will continue to be the dominant operator" of systems aboard the space station.

NASA's assessment of Russian motivations was less certain last month, when Mr. Bolden told another House subcommittee about receiving mixed messages from the Kremlin. "Rhetoric on the political side is not the same [as] when you talk about space exploration," Mr. Bolden testified in early March, adding that the U.S. was proceeding with plans for alternative propulsion systems for the space station if Russian modules eventually were removed.

During his testimony Thursday, Mr. Bolden also laid out his view of the federal government's difficult challenge in trying to keep up with fast-moving advances in commercial drone technology. Unless federal spending in this area grows, he told the panel, "I am not confident that we will stay ahead of industry and entrepreneurs" pushing to expand uses of unmanned aircraft. Additional taxpayer investments will be essential to help shape and oversee the budding industry, Mr. Bolden testified, "otherwise they will dwarf us."

Write to Andy Pasztor at andy.pasztor@wsj.com

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