The Russian probe destine for the Mars system never made it out of Earth Orbit and recently crashed back into Planet Earth. Why did the rocket ship fail? There has apparently been a lot of obfuscation of what caused this disaster, but now there is some better information. It may have been caused by a computer programming error.
In a report to be presented to Russian Deputy Prime Minister Dmitry Rogozin on Tuesday, investigators concluded that the primary cause of the failure was “a programming error which led to a simultaneous reboot of two working channels of an onboard computer,” the Russian state-owned news agency RIA Novosti reported.
Though it may have been more complicated than that, and partly due to inadequate electronic parts in the computer, according The Planetary Society.