The great PBS science series Nova scores another hit with Mars: Dead or Alive, capturing all the excitement surrounding the Mars rover landings of early 2004. Originally broadcast just as the first of the twin rovers (”Spirit” and “Opportunity”) was experiencing temporary communication problems with Earth-bound mission controllers, this riveting hour-long episode chronicles the risky $820 million Mars Exploration Rover (MER) project from design to touchdown, dramatically illustrating (through the use of detailed simulations and sophisticated computer animation) the considerable chances of failure–a nail-biting gamble considering that fully two-thirds of all previous Mars missions never reached their destination. Through rigorous testing and initial failure of the MER parachute system to the celebrated transmission of pristine photos from the “Spirit” landing site, we see just how intensely complex and emotionally involving the missions are, especially for Cornell University astronomer and lead MER scientist Steve Squyres and his devoted team of colleagues at Pasadena’s Jet Propulsion Laboratory. Careers are on the line as technical problems accumulate, and one feels the same mixture of dread, anxiety, and elation that accompanied the historic return of Apollo 13. A bonus interview with Mars-mission pioneer Donna Shirley puts everything into resonant perspective, celebrating science and the MER missions as an essential human endeavor.
Inside NASA’s risky field trip to the Red Planet.
Two-thirds of all spacecraft previously launched to Mars never reached their destination. Now, in a pioneering and risky mission, twin rovers named Spirit and Opportunity hurtle toward Mars at 12,000 miles per hour, with Spirit scheduled to touch down first. In the final “six minutes of terror” a parachute will open, giant protective airbags will inflate around the lander, and retrorockets will fire for a few seconds before Spirit is cut loose, bouncing its way to what everyone hopes will be a safe landing. To survive, Spirit will have to function perfectly. It will also have to be lucky, since there’s no way of knowing when a sharp rock or a gust of wind will ruin your day on Mars. Only then will Spirit be able to roll off the lander and begin its mission as a robot geologist, searching for clues that can tell us whether this harsh and barren planet was ever a place that could have supported life. Join NOVA for a tense and dramatic behind-the-scenes chronicle of the $820 million Mars Exploration Rover (MER) project, developed at NASA’s Jet Propulsion Laboratory in Pasadena, California. Beginning a year before launch, NOVA’s cameras follow MER scientists and engineers through a gauntlet of potentially fatal problems such as shredding parachutes, punctured airbags, and short circuits, any one of which could scuttle the mission before the rovers ever reach the launchpad. Then, seven months after launch, re-join NOVA and the NASA team in mission control for the final nail-biting minutes of the journey, as Spirit successfully lands on Mars and begins sending back its first spectacular images of the Martian landscape.
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خريد پستي Mars Dead or Alive ,علمی - تخيلی Sci-Fi, فروشگاه فيلم هاي مستند كتابخانه اينترنتي دانش گستران جوان You Research
خريد پستي Mars Dead or Alive ,علمی - تخيلی Sci-Fi, فروشگاه فيلم هاي مستند كتابخانه اينترنتي دانش گستران جوان You Research 