Does the “7 Minutes Of Terror” sound like a cheesy horror flick or a theme park ride to you? It’s not. That’s the phrase NASA used to describe the entry, descent and landing (also known as EDL) sequence of the Mars rover, Curiosity. Seven minutes is the time it took for Curiosity to go from the top of the Martian atmosphere to the surface of Mars. It was by far the most complicated and ambitious Mars landing ever attempted.
It required a carefully orchestrated set of maneuvers that had to be controlled entirely by computer. Even the slightest error could mean disaster. The spacecraft began to decelerate as it entered the Martian atmosphere and was guided using small rockets, then at approximately 1,000 mph a supersonic parachute was deployed to further slow the descent allowing the heat shield to separate at around 370 mph. Curiosity then separated from its parachute and began its powered descent at 70 mph using retrorockets that slowed the rover and brought it close enough to the surface that it could be lowered to the ground via a sky crane. It was a daring feat of engineering that captivated the world had everyone holding their breath until they heard the words of the mission controller, “Touchdown confirmed. We’re safe on Mars!”
Watch the “7 Minutes Of Terror” http://youtu.be/Ki_Af_o9Q9s
Download the full infographic here: http://www.jpl.nasa.gov/infographics/infographic.view.php?id=10776
Anyone else think the “7 Minutes Of Terror” would make an awesome theme park ride?
Star Sand, found only on a few beaches in southern Japan, is made up entirely of the calcified shells of marine protozoa that once lived on the ocean floor.
Coccolithophores are single celled eukaryotic phytoplankton that synthesize intricate exoskeletons from crystals of calcium carbonate. The functions of these coccoliths are unknown, and may include buoyancy, osmotic regulation, protection from UV light, predation, or mechanical shock. When nutrient and light conditions are optimal, coccolithophores can form massive plankton blooms that are visible from space. Large numbers of these organisms can accumulate on the ocean floor forming chalk deposits such as the White Cliffs of Dover.