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The US space shuttle Endeavour, seen here on June 16, 2009, ...

(AFP/Getty Images/File) — Wed, 01 Jul 2009 19:39:12 GMT

(AFP/Getty Images/File) - The US space shuttle Endeavour, seen here on June 16, 2009, sits on a launch pad 39-A at the Kennedy Space Center in Cape Canaveral, Florida. Endeavour has apparently cleared a test for potentially harmful hydrogen gas leaks that had twice delayed its high-profile launch, NASA said.(AFP/Getty Images/File/Eliot J. Schechter)

In this image provided by NASA the afternoon sun creates shadows ...

(AP) — Wed, 01 Jul 2009 11:05:25 GMT

(AP) - In this image provided by NASA the afternoon sun creates shadows on space shuttle Endeavour's external fuel tank as workers remove the seal from the Ground Umbilical Carrier Plate on the tank Wednesday June 24, 2009. A hydrogen leak at the location during tanking for the STS-127 mission caused the launch attempts to be scrubbed on June 13 and June 17. NASA plans a fueling test Wednesday July 1, 2009 of shuttle ahead of July 11 launch attempt. (AP Photo/NASA)

Engineers from the US space agency NASA think they have discovered ...

(AFP/File) — Tue, 23 Jun 2009 07:12:15 GMT

(AFP/File) - Engineers from the US space agency NASA think they have discovered the cause of a hydrogen leak which twice delayed a high-profile shuttle launch this month, according to the agency. It may now be all systems go for the space shuttle Endeavour, which is waiting to embark on its final mission to the International Space Station, after a dodgy gas line connection was uncovered during tests.(AFP/File/Stan Honda)

Vultures fly past a NASA logo at Kennedy Space Center. US ambitions ...

(AFP/File) — Thu, 18 Jun 2009 00:53:06 GMT

(AFP/File) - Vultures fly past a NASA logo at Kennedy Space Center. US ambitions of returning to the moon by 2020 and then heading to Mars risk being grounded because of "unrealistic" funds allocated to NASA, said Senator Bill Nelson, a former space shuttle astronaut.(AFP/File/Nicholas Kamm)

US ambitions of returning to the moon by 2020 and then heading ...

(AFP/File) — Thu, 18 Jun 2009 00:53:06 GMT

(AFP/File) - US ambitions of returning to the moon by 2020 and then heading to Mars risk being grounded because of "unrealistic" funds allocated to NASA, said Senator Bill Nelson, a former space shuttle astronaut.(AFP/File/Martin Bernetti)

The space shuttle Endeavour sits on launch Pad 39A following ...

(Reuters) — Wed, 17 Jun 2009 19:35:48 GMT

(Reuters) - The space shuttle Endeavour sits on launch Pad 39A following a scrubbed launch attempt at the Kennedy Space Center in Cape Canaveral, Florida June 17, 2009. NASA canceled the launch of space shuttle Endeavour on Wednesday for the second time after a potentially dangerous hydrogen gas leak surfaced while the ship was being fueled for flight. The next opportunity to launch Endeavour will be on July 11. REUTERS/Scott Audette (UNITED STATES SCI TECH)

The space shuttle Endeavour sits on launch Pad 39A following ...

(Reuters) — Wed, 17 Jun 2009 16:59:00 GMT

The hydrogen vent system (C) is connected to the space shuttle ...

(Reuters) — Wed, 17 Jun 2009 16:57:46 GMT

(Reuters) - The hydrogen vent system (C) is connected to the space shuttle Endeavour's Ground Umbilical Carrier Plate as it sits on launch Pad 39A following a scrubbed launch attempt at the Kennedy Space Center in Cape Canaveral, Florida June 17, 2009. NASA canceled the launch of space shuttle Endeavour on Wednesday for the second time after a potentially dangerous hydrogen gas leak surfaced while the ship was being fueled for flight. The next opportunity to launch Endeavour will be on July 11. REUTERS/Scott Audette (UNITED STATES SCI TECH)

The space shuttle Endeavour sits on launch Pad 39A following ...

(Reuters) — Wed, 17 Jun 2009 16:51:52 GMT

The space shuttle Endeavour sits on launch Pad 39A following ...

(Reuters) — Wed, 17 Jun 2009 16:50:27 GMT

Space shuttle Endeavour sits on launch pad 39-A Wednesday June ...

(AP) — Wed, 17 Jun 2009 16:14:47 GMT

(AP) - Space shuttle Endeavour sits on launch pad 39-A Wednesday June 17, 2009 at the Kennedy Space Center in Cape Canaveral, Fla. For the second time in four days, a potentially dangerous hydrogen gas leak has forced NASA to delay shuttle Endeavour's launch to the international space station. (AP Photo/Terry Renna)

Space shuttle Endeavour sits on launch pad 39-A Wednesday June ...

(AP) — Wed, 17 Jun 2009 16:13:45 GMT

Israeli Jewish Muslim and Christian children put their handprints ...

(AP) — Wed, 17 Jun 2009 15:44:05 GMT

(AP) - Israeli Jewish Muslim and Christian children put their handprints on the back of a banner that will be taken into space, at the YMCA Peace Preschool in Jerusalem, Wednesday, June 17, 2009. The banner will be blasting off with NASA's space shuttle on its next mission to the International Space Station in November 2009.(AP Photo/Tara Todras-Whitehill)

Israeli Jewish Muslim and Christian children sit around a banner ...

(AP) — Wed, 17 Jun 2009 15:43:44 GMT

(AP) - Israeli Jewish Muslim and Christian children sit around a banner that they helped make which will be taken into space, at the YMCA Peace Preschool in Jerusalem, Wednesday, June 17, 2009. The banner will be blasting off with NASA's space shuttle on its next mission to the International Space Station in November 2009.(AP Photo/Tara Todras-Whitehill)

An Israeli child holds up her hands after putting her handprints ...

(AP) — Wed, 17 Jun 2009 15:40:31 GMT

(AP) - An Israeli child holds up her hands after putting her handprints on the back of a banner that will be taken into space at the YMCA Peace Preschool in Jerusalem, Wednesday, June 17, 2009. The banner will be blasting off with NASA's space shuttle on its next mission to the International Space Station in November 2009. (AP Photo/Tara Todras-Whitehill)

NASA workers stand near the external fuel tank and solid rocket ...

(Reuters) — Wed, 17 Jun 2009 14:56:15 GMT

(Reuters) - NASA workers stand near the external fuel tank and solid rocket boosters of the space shuttle Endeavour as it sits on launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida June 15, 2009. REUTERS/Scott Audette

The space shuttle Endeavour sits on launch pad 39-A at the Kennedy ...

(AFP/Getty Images) — Wed, 17 Jun 2009 14:15:39 GMT

(AFP/Getty Images) - The space shuttle Endeavour sits on launch pad 39-A at the Kennedy Space Center. NASA has deferred the launch of its shuttle Endeavour for the second time in less than a week due to a nagging hydrogen leak whose cause experts are struggling to understand.(AFP/Getty Images/Eliot J. Schechter)

NASA Kennedy Space Center Director Bob Cabana, left, NASA Associate ...

(AP) — Wed, 17 Jun 2009 14:07:52 GMT

(AP) - NASA Kennedy Space Center Director Bob Cabana, left, NASA Associate Administrator for Space Operations Bill Gerstenmaier, center, and NASA Acting Administrator Chris Scolese are seen in firing room four of the NASA Kennedy Space Center as they monitor the progress of a leak at the Ground Umbilical Carrier Plate (GUCP) of the external tank of the space shuttle Endeavour at Cape Canaveral, Fla., on Wednesday June 17, 2009. For the second time in four days, a potentially dangerous hydrogen gas leak has forced NASA to delay shuttle Endeavour's launch to the international space station. (AP Photo/NASA, Bill Ingalls)

A NASA security officer patrols the waters near the space shuttle ...

(Reuters) — Wed, 17 Jun 2009 11:32:47 GMT

(Reuters) - A NASA security officer patrols the waters near the space shuttle Endeavour as it sits on launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida June 16, 2009. REUTERS/Scott Audette

NASA manager of Launch Integration LeRoy Cain (L) listens as ...

(Reuters) — Wed, 17 Jun 2009 08:10:07 GMT

(Reuters) - NASA manager of Launch Integration LeRoy Cain (L) listens as launch director Pete Nickolenko addresses the media after the scrub of the Space Shuttle Endeavour at the Kennedy Space Center in Cape Canaveral, Florida June 17, 2009. REUTERS/Scott Audette (UNITED STATES SCI TECH)

Pete Nickolenko, right, STS-127 Launch Director and LeRoy Cain, ...

(AP) — Wed, 17 Jun 2009 08:07:16 GMT

(AP) - Pete Nickolenko, right, STS-127 Launch Director and LeRoy Cain, NASA's Manager for Launch Integration, speak at a news conference early Thursday morning June 17, 2009 after the launch of the space shuttle Endeavour was scrubbed at the Kennedy Space Center in Cape Canaveral, Fla. The launch has now been delayed to no-earlier than July 11, 2009.(AP Photo/Terry Renna)

LeRoy Cain, NASA's Manager for Launch Integration, walks past ...

(AP) — Wed, 17 Jun 2009 08:07:00 GMT

(AP) - LeRoy Cain, NASA's Manager for Launch Integration, walks past a television monitor showing the space shuttle Endeavour, before speaking at a news conference early Thursday morning June 17, 2009 at the Kennedy Space Center in Cape Canaveral, Fla. The launch has now been delayed to no-earlier than July 11, 2009. (AP Photo/John Bazemore)

NASA manager of Launch Integration LeRoy Cain (L) addresses ...

(Reuters) — Wed, 17 Jun 2009 08:06:56 GMT

(Reuters) - NASA manager of Launch Integration LeRoy Cain (L) addresses the media after the scrub of the Space Shuttle Endeavour at the Kennedy Space Center in Cape Canaveral, Florida, June 17, 2009. REUTERS/Scott Audette (UNITED STATES SCI TECH)

An empty astronaut van is parked outside of the crew quarters ...

(Reuters) — Wed, 17 Jun 2009 06:36:36 GMT

(Reuters) - An empty astronaut van is parked outside of the crew quarters after the launch of the space shuttle Endeavour was canceled at the Kennedy Space Center in Cape Canaveral, Florida June 17, 2009. NASA canceled the launch of space shuttle Endeavour on Wednesday for the second time after a potentially dangerous hydrogen gas leak surfaced while the ship was being fueled. REUTERS/Scott Audette (UNITED STATES SCI TECH)

Space shuttle Endeavour sits on the launch pad early Wednesday ...

(AP) — Wed, 17 Jun 2009 05:23:16 GMT

(AP) - Space shuttle Endeavour sits on the launch pad early Wednesday morning June 17, 2009. Racing against the clock, NASA began fueling shuttle Endeavour for a Wednesday launch to the international space station after thunderstorms caused a three-hour delay. Hydrogen gas is leaking again from a vent line on space shuttle Endeavour's external fuel tank causing an additional delay and threatening to postpone the launch until July. (AP Photo)

The space shuttle Endeavour sits on launch pad 39A at the Kennedy ...

(Reuters) — Tue, 16 Jun 2009 17:09:43 GMT

(Reuters) - The space shuttle Endeavour sits on launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida June 16, 2009. REUTERS/Scott Audette (UNITED STATES SCI TECH)

The space shuttle Endeavour sits on launch pad 39A at the Kennedy ...

(Reuters) — Tue, 16 Jun 2009 17:07:27 GMT

(Reuters) - The space shuttle Endeavour sits on launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida June 16, 2009. REUTERS/Scott Audette (UNITED STATES SCI TECH)

A dragonfly sits on a branch as the space shuttle Endeavour ...

(Reuters) — Tue, 16 Jun 2009 16:51:47 GMT

(Reuters) - A dragonfly sits on a branch as the space shuttle Endeavour awaits launch on launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida June 16, 2009. REUTERS/Scott Audette (UNITED STATES SCI TECH)

The International Space Station as seen from the Space Shuttle ...

(AFP/File) — Tue, 16 Jun 2009 15:36:36 GMT

(AFP/File) - The International Space Station as seen from the Space Shuttle Discovery. The European Space Agency said it was in talks to extend the life of the International Space Station and get seats for its astronauts on future flights to the orbital outpost.(AFP/File/Nasa Photo)

Members of the media look on as the rotating service structure ...

(AP) — Tue, 16 Jun 2009 15:28:53 GMT

(AP) - Members of the media look on as the rotating service structure pulls away from the space shuttle Endeavour as she sits on launch pad 39A Tuesday morning June 16, 2009 at the Kennedy Space Center in Cape Canaveral, Fla. Seven astronauts are scheduled to liftoff early Wednesday morning for a trip to the international space station. (AP Photo/Wilfredo Lee)

The United States flag waves in the breeze as the space shuttle ...

(AP) — Tue, 16 Jun 2009 15:23:39 GMT

(AP) - The United States flag waves in the breeze as the space shuttle Endeavour sits on launch pad 39-A Tuesday morning June 16, 2009 at the Kennedy Space Center in Cape Canaveral, Fla. (AP Photo/John Bazemore)

The United States and orbiter flags wave in the breeze as the ...

(AP) — Tue, 16 Jun 2009 15:23:09 GMT

(AP) - The United States and orbiter flags wave in the breeze as the space shuttle Endeavour sits on launch pad 39-A Tuesday morning June 16, 2009 at the Kennedy Space Center in Cape Canaveral, Fla. (AP Photo/Wilfredo Lee)

US space shuttle Endeavour's solid rocket boosters and external ...

(AFP) — Tue, 16 Jun 2009 13:45:03 GMT

(AFP) - US space shuttle Endeavour's solid rocket boosters and external tank obscure the shuttle. NASA was on course to finish repairs to launch the shuttle Endeavour on Wednesday after its scheduled mission to the space station last week was postponed because of a gas leak.(AFP/Bruce Weaver)

The space shuttle Endeavour sits on launch pad 39A at the Kennedy ...

(Reuters) — Tue, 16 Jun 2009 12:03:47 GMT

(Reuters) - The space shuttle Endeavour sits on launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida June 16, 2009. NASA is planning to delay the launch of its new moon probe so it can try to launch space shuttle Endeavour on Wednesday on a construction mission to the International Space Station, officials said on Sunday. REUTERS/Pierre Ducharme (UNITED STATES SCI TECH)

US space shuttle Endeavour sits on the launch pad at Kennedy ...

(AFP/File) — Tue, 16 Jun 2009 11:10:11 GMT

(AFP/File) - US space shuttle Endeavour sits on the launch pad at Kennedy Space Center in Florida on June 13. NASA was on course to finish repairs to launch the shuttle Endeavour after its scheduled mission to the space station last week was postponed because of a gas leak.(AFP/File/Stan Honda)

Space Shuttle Endeavour sits on launch pad at Kennedy Space ...

(AFP/Getty Images/File) — Tue, 16 Jun 2009 06:50:30 GMT

(AFP/Getty Images/File) - Space Shuttle Endeavour sits on launch pad at Kennedy Space Center, Cape Canaveral, Florida. NASA was on course to finish repairs for its new June 17 launch date for the shuttle Endeavour, after its scheduled space station mission last week was postponed because of a gas leak(AFP/Getty Images/File/Eliot J. Schechter)

NASA workers inspect the space shuttle Endeavour's gaseous hydrogen ...

(AP) — Mon, 15 Jun 2009 21:31:40 GMT

(AP) - NASA workers inspect the space shuttle Endeavour's gaseous hydrogen venting system Monday June 15, 2009 at the Kennedy Space Center in Cape Canaveral, Fla. The leaking seal in the venting system forced a cancellation of last Saturday's planned liftoff. Seven astronauts are scheduled to liftoff early Wednesday morning for a 16-day mission to the international space station. (AP Photo/Chris O'Meara)

NASA workers inspect the space shuttle Endeavour's gaseous hydrogen ...

(AP) — Mon, 15 Jun 2009 21:31:21 GMT

(AP) - NASA workers inspect the space shuttle Endeavour's gaseous hydrogen venting system Monday, June 15, 2009 at the Kennedy Space Center in Cape Canaveral, Fla. The leaking seal in the venting system forced a cancellation of last Saturday's planned liftoff. Seven astronauts are scheduled to liftoff early Wednesday morning for a 16-day mission to the international space station. (AP Photo/Terry Renna)

NASA workers stand near the external fuel tank and solid rocket ...

(Reuters) — Mon, 15 Jun 2009 20:21:30 GMT

Space Shuttle Endeavour sits on launch pad 39A after the launch ...

(AFP/Getty Images/File) — Mon, 15 Jun 2009 20:20:44 GMT

(AFP/Getty Images/File) - Space Shuttle Endeavour sits on launch pad 39A after the launch was cancelled after sensors detected a hydrogen leak at Kennedy Space Center on June 13, 2009 in Cape Canaveral, Florida. NASA set a June 17 launch date for the shuttle Endeavour, after its scheduled mission last week to the International Space Station had to be postponed because of a hydrogen gas leak, the US space agency said.(AFP/Getty Images/File/Eliot J. Schechter)

NASA workers stand near the external fuel tank and solid rocket ...

(Reuters) — Mon, 15 Jun 2009 20:19:12 GMT

The space shuttle Endeavour sits on launch pad 39A at the Kennedy ...

(Reuters) — Mon, 15 Jun 2009 16:52:43 GMT

(Reuters) - The space shuttle Endeavour sits on launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida June 13, 2009. REUTERS/Scott Audette

An infrared shot of the Space Shuttle Endeavour on the launch ...

(AFP/Getty Images) — Mon, 15 Jun 2009 07:33:18 GMT

(AFP/Getty Images) - An infrared shot of the Space Shuttle Endeavour on the launch pad Cape Canaveral, Florida. The US space agency NASA says it is considering a June 17 launch for the shuttle Endeavour after its mission to the International Space Station was postponed over a hydrogen leak(AFP/Getty Images/Eliot J. Schechter)

The space shuttle Endeavour sits on launch pad 39A during sunset ...

(Reuters) — Sun, 14 Jun 2009 22:19:16 GMT

(Reuters) - The space shuttle Endeavour sits on launch pad 39A during sunset at the Kennedy Space Center in Cape Canaveral, Florida June 12, 2009.

The US Space Shuttle Endeavour's crew (L-R) Tim Kopra, Tom ...

(AFP/File) — Sat, 13 Jun 2009 20:39:28 GMT

(AFP/File) - The US Space Shuttle Endeavour's crew (L-R) Tim Kopra, Tom Marshburn, Cris Cassidy, Canadian Julie Payette, Commander Mark Polansky, Doug Hurley and Dave Wolf. The launch of the US space shuttle has been delayed following a hydrogen leak, postponing a mission to the International Space Station by at least four days.(AFP/File/Bruce Weaver)

A technician in blue coveralls checks the gaseous oxygen vent ...

(AFP) — Sat, 13 Jun 2009 20:39:28 GMT

(AFP) - A technician in blue coveralls checks the gaseous oxygen vent hood seal atop the external fuel tank on US space shuttle Endeavour at Kennedy Space Center in Florida. The launch of the US space shuttle has been delayed following a hydrogen leak, postponing a mission to the International Space Station by at least four days.(AFP/Bruce Weaver)

The launch of the US space shuttle Endeavour, seen here at Kennedy ...

(AFP) — Sat, 13 Jun 2009 20:39:28 GMT

(AFP) - The launch of the US space shuttle Endeavour, seen here at Kennedy Space Center in Florida, has been delayed following a hydrogen leak, postponing a mission to the International Space Station by at least four days.(AFP/Stan Honda)

The space shuttle Endeavour sits on launch pad 39A at the Kennedy ...

(Reuters) — Sat, 13 Jun 2009 15:39:55 GMT

(Reuters) - The space shuttle Endeavour sits on launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida June 13, 2009. Endeavour's launch attempt for Saturday was scrubbed due to a hydrogen leak. REUTERS/Scott Audette (UNITED STATES SCI TECH)

The space shuttle Endeavour sits on Launch Pad 39-A hours after ...

(AP) — Sat, 13 Jun 2009 15:36:48 GMT

(AP) - The space shuttle Endeavour sits on Launch Pad 39-A hours after being scrubbed due a hydrogen leak Saturday morning, June 13, 2009 at the Kennedy Space Center in Cape Canaveral, Fla. Seven astronauts were scheduled to liftoff on a trip to the international space station. (AP Photo/Chris O'Meara)

The space shuttle Endeavour sits on launch pad 39A at the Kennedy ...

(Reuters) — Sat, 13 Jun 2009 15:34:14 GMT

(Reuters) - The space shuttle Endeavour sits on launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida June 13, 2009. NASA canceled plans to launch Endeavour on a construction mission to the International Space Station on Saturday due to a potentially dangerous hydrogen leak. REUTERS/Scott Audette (UNITED STATES SCI TECH IMAGES OF THE DAY)