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NASA Mars Rover Will Face Harrowing Descent, Landing

  • Suzanne Presto

The U.S. space agency is preparing for its newest Mars rover, Curiosity, to touch down on the Red Planet on August 6. The rover's entry and descent will be nerve-wracking for NASA engineers, compounded by a 14-minute delay as the rover's signals travel to Earth from Mars. If successful, Curiosity will be the seventh NASA spacecraft to land on the Red Planet.
Curiosity is the centerpiece of the $2.5 billion Mars Science Laboratory spacecraft, launched in November aboard an Atlas V rocket. It's traveled some 560 million kilometers toward its destination, the Red Planet.
  • How Big Is It?: At 2.8 meters long, the Mini Cooper-sized rover is much bigger than its rover predecessors, Spirit, Opportunity and Sojourner.
  • Landing: Where and How: Curiosity will land near the foot of a mountain taller than Pike's Peak near the middle of Gale Crater, which is the size of Connecticut and Rhode Island combined.
  • Toolkit: Curiosity will use 10 science instruments to examine rocks, soil and the atmosphere.
  • Big Wheels: Each of Curiosity's six wheels has an independent drive motor. The two front and two rear wheels also have individual steering motors. The wheels' diameter is double the wheel diameter on Spirit and Opportunity, which will help Curiosity roll over obstacles up to 75 centimeters high.
  • Rover Power: A nuclear battery will enable Curiosity to operate year-round and farther from the equator than would be possible with only solar power.

    Courtesy NASA - Click for More
Curiosity is a "Mars scientist's dream machine," said Deputy Project Scientist Ashwin Vasavada ahead of its launch. "This rover is not only the most technically capable rover ever sent to another planet, but it's actually the most capable scientific explorer we've ever sent out," he said.
Curiosity will be traveling at about 20,000 kilometers per hour when it hits the Martian atmosphere. It will have only seven minutes to reduce its speed for a soft landing. NASA engineers will not be able to control or even witness the events in real time. They call this period "seven minutes of terror." (A NASA animation shows how the landing sequence works).
Ideally, after a parachute deploys, engines will fire for a powered descent.
Curiosity will be lowered to the Martian surface on cables and cut loose. Then the rocket pack will blast off.
Curiosity is the size of a small car and has 17 cameras. It's much larger than previous rovers and can travel as far as 200 meters per day.
It's a nuclear-powered mobile laboratory.
The remote-controlled vehicle can gather samples of soil and rocks and analyze them using instruments onboard.
The goal is to see if the area ever had environmental conditions that could have supported microbial life, explains Vasavada. "This mission is really about looking for those habitable environments, and not detecting life itself," he said.
A team of space agency scientists selected the landing site, the foot of a mountain within a deep, 150-kilometer-wide depression called Gale Crater. Each layer of rock contains clues about the planet's evolution.
Curiosity will investigate Martian geology, weather and radiation levels during the mission, which is expected to last about two Earth years. . .the equivalent of one Martian year.

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