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jrepin writes "On day two of the 2013 Embedded Linux Conference, Robert Rose of SpaceX spoke about the "Lessons Learned Developing Software for Space Vehicles". In his talk, he discussed how SpaceX develops its Linux-based software for a wide variety of tasks needed to put spacecraft into orbit—and eventually beyond. Linux runs everywhere at SpaceX, he said, on everything from desktops to spacecraft."

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Before the space shuttle Discovery made its farewell flyover this week, it had to be attached to a 747 in what NASA calls the mate-demate device at the Kennedy Space center in Florida. The Boeing 747, called the Shuttle Carrier Aircraft (SCA), was an ordinary commercial jet before being modified at NASA to transport shuttles between earthbound locations.

Observers gathered along the coast to watch as the SCA escorted the Discovery shuttle to Washington, where Discovery will be on display at the Smithsonian’s National Air and Space Museum. It’s not surprising that Discovery looks a little worse for the wear: In 39 different missions, Discovery orbited the Earth 5,830 times and traveled 148,221,675 miles. Highlights of the shuttle’s career include deploying the Hubble Space Telescope, completing the first space-shuttle rendezvous and the final shuttle docking with the Russian space station Mir. Discovery also docked with the International Space Station 13 times and supplied more than 31,000 pounds of hardware for the space laboratory.


The SCA and the space shuttle Discovery on the ramp of the Shuttle Landing Facility at NASA’s Kennedy Space Center in Florida. Earlier, the duo backed out of the mate-demate device. Known as the MDD, the device is a large gantry-like steel structure used to hoist a shuttle off the ground and position it onto the back of the aircraft, or SCA. NASA/Kim Shiflett


The Shuttle Carrier Aircraft carrying space shuttle Discovery backs out of the Shuttle Landing Facility’s mate-demate device at NASA’s Kennedy Space Center in Florida. NASA/Kim Shiflett


The SCA transporting space shuttle Discovery to its new home takes off from the Shuttle Landing Facility at NASA’s Kennedy Space Center in Florida at about 7 a.m. EDT. The duo fly south over Brevard County’s beach communities for residents to get a look at the shuttle before it leaves the Space Coast for the last time. NASA/Jim Grossmann


Workers use two cranes to position the sling that will be used to demate the space shuttle Discovery at the Apron W area of Washington Dulles international Airport in Sterling, Va. NASA/Bill Ingalls


The space shuttle Discovery is suspended from a sling held by two cranes after the SCA was pushed back from underneath at Washington Dulles International Airport, Thursday, April 19, 2012, in Sterling, VA. NASA/Bill Ingalls

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From its first launch 30 years ago to its final launch scheduled for next Friday, NASA's Space Shuttle program has seen moments of dizzying inspiration and of crushing disappointment. When next week's launch is complete, the program will have sent up 135 missions, ferrying more than 350 humans and thousands of tons of material and equipment into low Earth orbit. Fourteen astronauts have lost their lives along the way -- the missions have always been risky, the engineering complex, the hazards extreme. As we near the end of the program, I'd like to look back at the past few decades of shuttle development and missions as we await the next steps toward human space flight. [61 photos]

Space Shuttle Columbia lifts off from Kennedy Space Center, on April 12, 1981. Commander John Young and pilot Robert Crippen were onboard STS-1, the first orbital flight of the Space Shuttle program. (Reuters/NASA/KSC)

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