At NASA's Kennedy Space Center in Florida, the six STS-129 crew members will board the cockpit inside space shuttle Atlantis on Launch Pad 39A. They will go through a complete launch countdown simulation right up to the point of liftoff.

This is part of the Terminal Countdown Demonstration Test, or TCDT, typically conducted during a 3-day period about two weeks prior to launch. But this practice session was postponed because of a scheduling conflict with the launch of NASA's Ares I-X test rocket.

After the launch simulation and emergency pad escape training, the astronauts will inspect the cargo that they'll fly to the International Space Station before returning to NASA's Johnson Space Center in Houston this afternoon.

Atlantis is scheduled to launch on its 11-day supply mission to the space station on Nov. 16 at 2:28 p.m. EST.

The Mercury Surface, Space Environment, Geochemistry and Ranging spacecraft, known as MESSENGER, flew by Mercury on Sept. 29. The probe completed a critical gravity assist to remain on course to enter into orbit around Mercury in 2011. Despite shutting down temporarily because of a power system switchover during a solar eclipse, the spacecraft's cameras and instruments collected high-resolution and color images unveiling another 6 percent of the planet's surface never before seen at close range.

Approximately 98 percent of Mercury's surface now has been imaged by NASA spacecraft. After MESSENGER goes into orbit around Mercury, it will see the polar regions, which are the only unobserved areas of the planet.

"Although the area viewed for the first time by spacecraft was less than 350 miles across at the equator, the new images reminded us that Mercury continues to hold surprises," said Sean Solomon, principal investigator for the mission and director of the Department of Terrestrial Magnetism at the Carnegie Institution of Washington.

Many new features were revealed during the third flyby, including a region with a bright area surrounding an irregular depression, suspected to be volcanic in origin. Other images revealed a double-ring impact basin approximately 180 miles across. The basin is similar to a feature scientists call the Raditladi basin, which was viewed during the probe's first flyby of Mercury in January 2008.

"This double-ring basin, seen in detail for the first time, is remarkably well preserved," said Brett Denevi, a member of the probe's imaging team and a postdoctoral researcher at Arizona State University in Tempe. "One similarity to Raditladi is its age, which has been estimated to be approximately one billion years old. Such an age is quite young for an impact basin, because most basins are about four times older. The inner floor of this basin is even younger than the basin itself and differs in color from its surroundings. We may have found the youngest volcanic material on Mercury."

One of the spacecraft's instruments conducted its most extensive observations to date of Mercury's exosphere, or thin atmosphere, during this encounter. The flyby allowed for the first detailed scans over Mercury's north and south poles. The probe also has begun to reveal how Mercury's atmosphere varies with its distance from the sun.

"A striking illustration of what we call 'seasonal' effects in Mercury's exosphere is that the neutral sodium tail, so prominent in the first two flybys, is 10 to 20 times less intense in emission and significantly reduced in extent," says participating scientist Ron Vervack, of the Johns Hopkins University Applied Physics Laboratory, or APL, in Laurel, Md. "This difference is related to expected variations in solar radiation pressure as Mercury moves in its orbit and demonstrates why Mercury's exosphere is one of the most dynamic in the solar system."

The observations also show that calcium and magnesium exhibit different seasonal changes than sodium. Studying the seasonal changes in all exospheric constituents during the mission orbital phase will provide key information on the relative importance of the processes that generate, sustain, and modify Mercury's atmosphere.

The third flyby also revealed new information on the abundances of iron and titanium in Mercury's surface materials. Earlier Earth and spacecraft-based observations showed that Mercury's surface has a very low concentration of iron in silicate minerals, a result that led to the view that the planet's crust is generally low in iron.

"Now we know Mercury's surface has an average iron and titanium abundance that is higher than most of us expected, similar to some lunar mare basalts," says David Lawrence, an APL participating mission scientist.

The spacecraft has completed nearly three-quarters of its 4.9-billion-mile journey to enter orbit around Mercury. The full trip will include more than 15 trips around the sun. In addition to flying by Mercury, the spacecraft flew past Earth in August 2005 and Venus in October 2006 and June 2007.

The spacecraft was designed and built by APL. The mission is managed and operated by APL for NASA's Science Mission Directorate in Washington.

Space shuttle Atlantis, its crew and payload have been given the green light to launch to the International Space Station on Nov. 16 at 2:28 p.m. EST.

At the post-FRR press briefing held at NASA's Kennedy Space Center in Florida, Bill Gerstenmaier, associate administrator for Space Operations congratulated the Ares I-X launch team for a successful flight test. He then talked about the extremely thorough review of vast amounts of data that led to announcing that Atlantis is certified to launch.

"We accomplished what we wanted to to get ready to move to the next activity ... with just a little bit of open work left to do," said Gerstenmaier.

Mike Moses, space shuttle launch integration manager thanked the teams across the country for their hard work getting Atlantis into good shape for the launch. He highlighted the Kennedy teams, complimenting them for working on preparations for both the Atlantis and Ares I-X launches at the same time.

"I'm really pleased -- this is going to be a challenging 11-day mission with three EVAs; the cargo resupply to the station is going to set them up for the future," said Moses.

Mike Leinbach, space shuttle launch director said Atlantis' payload for the STS-129 mission will be transported to Launch Pad 39A by Friday morning. The pad's rotating service structure, or RSS, which protects the shuttle against inclement weather and also provides access to the vehicle's payload bay, is being rolled away. This will allow techs to lift Atlantis' payload up to the pad for installation into the shuttle's cargo bay.

"It's a standard path flow for us and we have little bit of contingency hidden in the flow, so no problems there, said Leinbach. "We should be able to get to our T-0 on the 16th with no issues at all."

The Nov. 16 target date will depend on the planned Nov. 14 launch of an Atlas V rocket from nearby Cape Canaveral Air Force Station. The Atlas has reserved the Eastern Range on Nov. 14 and 15. But if the Atlas launch is delayed to Nov. 15, the shuttle's liftoff will move to no earlier than 2:02 p.m. on Nov. 17.

The only spoiler when tomorrow morning's launch window opens at 8 a.m. EDT might be the weather. Currently, there only is a 40 percent chance of favorable weather during the window, which extends until noon. The team will have the same four-hour window for a launch attempt on Wednesday if Tuesday's liftoff is scrubbed, and Wednesday's weather shows a slight improvement to 60 percent "go."

The launch team of approximately 30 members will have their "call to stations" at 12:30 a.m., leading into the beginning of the seven-hour countdown at 1 a.m.

Peering far beyond our solar system, NASA researchers have detected the basic chemistry for life in a second hot gas planet, advancing astronomers toward the goal of being able to characterize planets where life could exist. The planet is not habitable but it has the same chemistry that, if found around a rocky planet in the future, could indicate the presence of life.

"It's the second planet outside our solar system in which water, methane and carbon dioxide have been found, which are potentially important for biological processes in habitable planets," said researcher Mark Swain of NASA's Jet Propulsion Laboratory, Pasadena, Calif. "Detecting organic compounds in two exoplanets now raises the possibility that it will become commonplace to find planets with molecules that may be tied to life."

Swain and his co-investigators used data from two of NASA's orbiting Great Observatories, the Hubble Space Telescope and Spitzer Space Telescope, to study HD 209458b, a hot, gaseous giant planet bigger than Jupiter that orbits a sun-like star about 150 light years away in the constellation Pegasus. The new finding follows their breakthrough discovery in December 2008 of carbon dioxide around another hot, Jupiter-size planet, HD 189733b. Earlier Hubble and Spitzer observations of that planet had also revealed water vapor and methane.

The detections were made through spectroscopy, which splits light into its components to reveal the distinctive spectral signatures of different chemicals. Data from Hubble's near-infrared camera and multi-object spectrometer revealed the presence of the molecules, and data from Spitzer's photometer and infrared spectrometer measured their amounts.

"This demonstrates that we can detect the molecules that matter for life processes," said Swain. Astronomers can now begin comparing the two planetary atmospheres for differences and similarities. For example, the relative amounts of water and carbon dioxide in the two planets is similar, but HD 209458b shows a greater abundance of methane than HD 189733b. "The high methane abundance is telling us something," said Swain. "It could mean there was something special about the formation of this planet."

Other large, hot Jupiter-type planets can be characterized and compared using existing instruments, Swain said. This work will lay the groundwork for the type of analysis astronomers eventually will need to perform in shortlisting any promising rocky Earth-like planets where the signatures of organic chemicals might indicate the presence of life.

Rocky worlds are expected to be found by NASA's Kepler mission, which launched earlier this year, but astronomers believe we are a decade or so away from being able to detect any chemical signs of life on such a body.

If and when such Earth-like planets are found in the future, "the detection of organic compounds will not necessarily mean there's life on a planet, because there are other ways to generate such molecules," Swain said. "If we detect organic chemicals on a rocky, Earth-like planet, we will want to understand enough about the planet to rule out non-life processes that could have led to those chemicals being there."

"These objects are too far away to send probes to, so the only way we're ever going to learn anything about them is to point telescopes at them. Spectroscopy provides a powerful tool to determine their chemistry and dynamics."

You can follow the history of planet hunting from science fiction to science fact with NASA's PlanetQuest Historic Timeline at http://planetquest.jpl.nasa.gov/timeline/ .

This interactive web feature, developed by JPL, conveys the story of exoplanet exploration through a rich tapestry of words and images spanning thousands of years, beginning with the musings of ancient philosophers and continuing through the current era of space-based observations by NASA's Spitzer and Kepler missions. The timeline highlights milestones in culture, technology and science, and includes a planet counter that tracks the pace of exoplanet discoveries over time.

More information about exoplanets and NASA's planet-finding program is at http://planetquest.jpl.nasa.gov .

The Hubble Space Telescope is a project of international cooperation between NASA and the European Space Agency and is managed by NASA's Goddard Space Flight Center in Greenbelt, Md. The Space Telescope Science Institute, Baltimore, Md., conducts Hubble science operations. The institute is operated for NASA by the Association of Universities for research in Astronomy, Inc., Washington, D.C.

JPL manages the Spitzer Space Telescope mission for NASA. Science operations are conducted at the Spitzer Science Center at the California Institute of Technology in Pasadena. Caltech manages JPL for NASA.

The crawler-transporter left Kennedy's Vehicle Assembly Building at 1:39 a.m., traveling less than 1 mph during the 4.2-mile journey. The rocket was secured on the launch pad at 9:17 a.m.

The vehicle is scheduled to launch at 8 a.m. on Oct. 27. This test flight of the Ares I-X rocket will provide NASA an early opportunity to test and prove hardware, models, facilities and ground operations associated with the Ares I launch vehicle.

The Ares I rocket is being designed to carry astronauts to space in the Orion crew exploration vehicle. The Ares I-X test flight also will allow NASA to gather critical data during ascent of the vehicle's integrated stack, which includes the Ares I with a simulated upper stage, Orion and launch abort system. Data collected from more than 700 sensors throughout the rocket will begin to confirm the vehicle as a whole is safe and stable in flight before astronauts begin traveling into orbit.

"With the arrival of Ares I-X at the pad, this milestone demonstrates NASA's world-class ability to conceptually design, build and process a new launch vehicle in just under four years," said Bob Ess, mission manager for Ares I-X at Kennedy. "Nearly 2,000 NASA and contractor employees located throughout the United States worked together in an unprecedented fashion, resulting in the new vehicle ready for flight."

During the week before launch, technicians at the pad will perform a variety of electrical and mechanical checks to ready the vehicle for flight, including hydraulic power unit hot fire, steering tests and internal power verifications using flight batteries.

United Space Alliance of Houston is NASA's prime contractor for the ground processing of the Ares I-X rocket.

"Processing for the Ares I-X test flight in parallel with space shuttle operations has been a true challenge involving people and hardware from across the country, and we're very proud of what the team has accomplished," said Mark Nappi, vice president of Launch and Recovery Systems for United Space Alliance.

ATK Space Systems of Magna, Utah, is NASA's prime contractor for the first stage of the rocket.

"The NASA and contractor teamwork displayed over the last four years has been the catalyst that brought us to this important milestone today," said Bob Herman, ATK's vice president of Exploration Systems for Kennedy Space Center Operations. "As the Ares I first stage provider, we are looking forward to receiving invaluable data during the flight test."

At the Flight Test Readiness Review on Oct. 23, mission managers will finalize the launch date and provide the team with a final "go" or "no go" for launch.

Ares I-X is an un-crewed, sub-orbital development test in a modified Ares I configuration. Ares I-X is the first developmental flight test of the Constellation Program, which includes the Ares I and V rockets, Orion and the Altair lunar lander.

Senior managers met Monday and decided to adjust Atlantis' target launch date to optimize the agency's ability to launch both Ares I-X and Atlantis before the end of the year. The same launch team at Kennedy is supporting both the shuttle and the flight test of the Ares I-X rocket, which is targeted to lift off on Oct. 27.

Atlantis' new target launch date will give Ares I-X launch opportunities Oct. 27, 28 and 29. NASA has yet to schedule Atlantis' new target liftoff date on the Eastern Range.

The change to Atlantis' targeted launch will affect the launch countdown dress rehearsal for the shuttle's six astronauts. The astronauts arrived at Kennedy on Monday for the Terminal Countdown Demonstration Test and related training. The simulated countdown has been rescheduled to Nov. 3. The astronauts will practice emergency escape and other related training while they are at Kennedy this week and return there Nov. 2 to conclude their rehearsal work.

The agency's Flight Readiness Review meeting for STS-129 is set for Oct. 29. NASA will schedule an official launch date for Atlantis at that meeting.

Except for Mission Specialist Leland Melvin, the crew arrived at Kennedy's Shuttle Landing Facility in four T-38 training jets at 11:24 a.m. EDT. Melvin is on the way to Kennedy on a NASA G2 jet.

From NASA WASHINGTON - Human Space Flight Review Committee Chairman Norman Augustine will hold a press conference at 1 p.m. EDT, on Thursday, Oct. 22, in the Zenger Room of the National Press Club, 529 14th St. NW, in Washington.

Augustine will be accompanied by committee member Ed Crawley. Printed copies of the committee's final report will be available during the press conference and an electronic copy of the report will be posted to the committee's Web site at the start of the briefing.

The pad's protective rotating service structure will be closed around the shuttle tonight, and launch pad teams will begin preparations to support Atlantis' targeted Nov. 12 launch at 4:04 p.m. EST.

The STS-129 astronauts are scheduled to fly to Kennedy on Oct. 19 to participate in the three-day Terminal Countdown Demonstration Test, or TCDT. This training gives the crew an opportunity to check the fit of their spacesuits, practice emergency evacuation procedures at the launch pad, review firefighting methods and participate in a simulated launch countdown.

The briefing participants are:
- David McComas, IBEX spacecraft principal investigator and assistant vice president, Space Science and Engineering Division, Southwest Research Institute in San Antonio
- Eric Christian, IBEX deputy mission scientist, NASA's Goddard Space Flight Center in Greenbelt, Md.
- Rosine Lallement, senior scientist at the French National Center for Scientific Research in Paris
- Lindsay Bartolone, lead of Education and Public Outreach at the Adler Planetarium in Chicago
- Don Mitchell, Cassini spacecraft instrument scientist, IBEX co-Investigator, Johns Hopkins University Applied Physics Laboratory in Laurel, Md.

At NASA's Johnson Space Center in Houston, the six STS-129 mission astronauts have the Columbus Day holiday off and will resume training on Tuesday morning.

The crew is scheduled to fly to Kennedy on Oct. 19 to participate in the three-day Terminal Countdown Demonstration Test, or TCDT. Typically held prior to launch, TCDT gives the crew an opportunity to check the fit of their spacesuits, practice emergency evacuation procedures at the launch pad, review firefighting methods, and participate in briefings on security and range safety.

Atlantis is targeted to launch to the International Space Station at 4:04 p.m. EST Nov. 12 on an 11-day mission.