Hello All!   
      
   Mars Landing Sky Show    
      
   July 29, 2012:  Every time NASA lands a rover on Mars--or even makes the   
   attempt--it is cause for celebration. On August 5th, the heavens themselves   
   are aligning to mark the event.    
      
   Only a few hours before the Mars Science Lab spacecraft reaches the red planet   
   and drops Curiosity on a hair-raising descent mission planners have dubbed the   
   "seven minutes of terror," Mars itself will be put on a special show in the   
   sunset skies of Earth: Together with Saturn and Spica (a blue giant star in   
   the constellation Virgo), the Red Planet will form a "Martian Triangle"   
   visible from almost all parts of our planet.    
      
   http://www.youtube.com/watch?v=QrxCA1leQyY   
      
   A new ScienceCast video tells you how to see the "Martian Triangle" on August   
   5th. Play it   
      
   Go outside after sunset on August 5th and look west where the setting sun has   
   just disappeared. As soon as the sky fades to black, a triangle of   
   first-magnitude lights will pop out of the twilight. The vertices are Mars,   
   Saturn, and Spica. Together, they form an equilateral triangle about 5 degrees   
   on each side.  This means you could hide the Martian Triangle behind your   
   outstretched palm.  It would also fit comfortably inside the bowl of the Big   
   Dipper.  The tightness of the triangle makes it extra eye-catching.    
      
   The three objects are very different: Mars is a small rocky planet relatively   
   close to Earth; Saturn is a ringed gas giant halfway across the solar system;   
   Spica is a massive binary star on the other side of our galactic spiral arm.   
   Nevertheless, they shine with the same intensity as seen from Earth. On the   
   scale of astronomical brightness, all three are ranked first magnitude.  This   
   makes them easy to see with the unaided eye.    
      
   http://www.nasa.gov/mission_pages/mars/main/index.html   
      
   For the full story and updates about Curiosity's mission, visit NASA's Mars   
   PortalNot long after the Martian Triangle follows the sun below the horizon,   
   the real action begins:    
      
   At approximately 10:30 pm PDT, Curiosity's entry capsule will slam into the   
   upper atmosphere of Mars raising temperatures around the heat shield to 2100   
   C--more than twice as hot as basaltic lava.    
      
   What happens next seems almost unbelievable. Because Curiosity is so much   
   bigger and heavier than any previous rover, old ways of landing, such as air   
   bags, wouldn't work.  Mission planners had to come up with something new and   
   unorthodox.  Reporter Scott Gold of the LA Times described it this way:    
      
   "In the time it takes to drive to the grocery store, the spacecraft will   
   change shape like a toy Transformer six times, slowing from 13,000 mph to 1.7   
   mph while using 76 pyrotechnic devices, ropes, knives and the largest   
   supersonic parachute ever built."    
      
   At the end of the maneuver, a "Sky Crane" gently lowers the rover onto the   
   floor of Gale Crater.    
      
   If the rover survives the hair-raising descent and lands intact as planned, it   
   will mark the beginning of an extraordinary mission of discovery.  Bristling   
   with the most advanced sensors ever sent to Mars, the one-ton rover will spend   
   the next two years (at least) finding out whether one of the most intriguing   
   places in the solar system ever offered an environment favorable for   
   microscopic life.    
      
   Let's just say, it's a good reason to go stand outside under the stars.    
      
   After the Martian Triangle sets, go inside and turn on NASA TV for the Mars   
   landing itself. The real show is about to begin.    
      
   For more news about Mars--as seen from your backyard and Curiosity's--visit   
   science.nasa.gov.    
      
      
   Author: Dr. Tony Phillips| Production editor: Dr. Tony Phillips | Credit:   
   Science@NASA   
      
   More Information    
    NASA TV -- Join NASA in the control room for the landing of Curiosity    
      
   The Mars Portal -- all things Mars    
       
      
   Regards,   
      
   Roger    
   --- timEd/386 1.10.y2k+   
    * Origin: NCS BBS - Houma, LA - (1:3828/7)