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Cape Canaveral - The crew of Atlantis began deorbit procedures on Thursday just hours ahead of its final return to Earth that will bring down the curtain on Nasa's 30-year space shuttle programme.
The four American astronauts onboard shuttered the vessel's payload bay doors, retracted its orbital navigational systems and made final preparations on the historic flight home to Kennedy Space Center, where Nasa meteorologists were forecasting perfect conditions for the shuttle's pre-dawn landing.
Earlier the crew woke to the song "God Bless America," in preparation for the bittersweet end to the storied shuttle career, 42 years after US astronaut Neil Armstrong became the first person to step foot on the Moon as part of the Apollo 11 mission.
Atlantis was set to land at 5:56 am (09:56 GMT), making it a rare night landing, and Nasa was describing a "gorgeous night at the Kennedy Space Center."
"Sounds pretty promising to me," commander Chris Ferguson told mission control.
On Wednesday the astronauts said they were anxious to celebrate the landing with the shuttle's on-the-ground crew.
"We're very excited about seeing those folks...to share the memories of the mission with them and once again just convey how proud we are of them and what they've done over this 30 year programme," shuttle pilot Doug Hurley said from Atlantis as he answered questions from the media.
Atlantis' landing will end an era of US dominance in human space exploration, leaving Russia as the sole taxi to the International Space Station until a replacement US capsule can be built by private industry.
The crew on shuttle mission STS-135 savored their final hours in orbit after a successful trip to restock the ISS for a year with several tons of supplies and food.
Final inspections of the shuttle's heat shield, which protects the spacecraft during its fiery transition into Earth's atmosphere, were completed on Wednesday and Nasa said the spacecraft looked to be in good shape for landing.
The deorbit burn is set for 4:49 am (08:49 GMT) to re-enter Earth's atmosphere.
"Forty-two years ago today, Neil Armstrong walked on the moon and I consider myself fortunate that I was there to actually remember the event," Ferguson told mission control, recalling the images of July 20, 1969.
"It is kind of interesting to be here on the final night of the shuttle mission. We don't quite know what to think. We are just trying to take it all in."
Ferguson then read a quote by Apollo-era flight director Gene Kranz, best known for leading mission control's successful effort to save the Apollo 13 astronauts after an oxygen tank exploded on a trip to the Moon.
"I pray that our nation will someday find the courage to accept the risk and challenges to finish the work that we started," the commander said, calling the quote by Kranz, whose hero role was showcased in a 1995 movie starring Tom Hanks as an astronaut and Ed Harris as Kranz, "very appropriate."
Over the course of the program, five Nasa shuttles - Atlantis, Challenger, Columbia, Discovery and Endeavour - have comprised a fleet designed as the world's first reusable space vehicles.
The first shuttle flight to space lifted off April 12, 1981.
Columbia and Challenger were destroyed in accidents that killed their crews, leaving only three in the space-flying fleet and Enterprise, a prototype that never flew in space. The quartet will become museum pieces in the coming months.
Critics have assailed the US space agency for lacking a focus with the space shuttle gone and no next-generation human spaceflight program to immediately replace it.
The astronaut corps now numbers 60, compared to the 128 employed in 2000, and thousands of people are being laid off from Kennedy Space Center. But Nasa chiefs say future missions to deep space should revive hope in the US programme.
"We have just not done a good job of telling our story. Nasa is very busy," the agency's administrator Charles Bolden told CNN.
"The president said to us, 2025 for an asteroid and 2030 to Mars. We have a lot of work to do ahead."
According to Nasa's website, they are building a Multi-Purpose Crew Vehicle that hopes to reach that goal.
Nasa aims to turn over low-orbit space travel and space station servicing to commercial ventures, with a commercial launcher and capsule built by a private corporation in partnership with Nasa ready to tote crew members after 2015.
Until the private sector fills the void, the world's astronauts will rely on Russian Soyuz rockets for rides to the ISS.
Nasa flight director Tony Ceccacci said his team was just trying to keep emotions at bay and focus on getting the shuttle home safely.
"We have a motto in the mission control center that flight controllers don't cry, so we are going to make sure that we keep to that."
