Curiosity's First Daredevil Stunt
August 2, 2012: When Curiosity enters the Martian atmosphere on August 6th, setting in motion "the seven minutes of terror" that people around the world have anticipated since launch a year ago, the intrepid rover will actually be performing the mission's second daredevil stunt.
The first was completed in July.
For the past nine months, Curiosity has been acting as a stunt double for astronauts, exposing itself to the same cosmic radiation humans would experience following the same route to Mars1.
"Curiosity has been hit by five major flares and solar particle events in the Earth-Mars expanse," says Don Hassler of the Southwest Research Institute in Boulder, Colorado. "The rover is safe, and it has been beaming back invaluable data."
Unlike previous Mars rovers, Curiosity is equipped with an instrument that measures space radiation. The Radiation Assessment Detector, nicknamed "RAD," counts cosmic rays, neutrons, protons and other particles over a wide range of biologically-interesting energies. RADs prime mission is to investigate the radiation environment on the surface of Mars, but NASA turned it on during the cruise phase so that it could sense radiation en route to Mars as well.
Curiosity’s location inside the spacecraft is key to the experiment.
"Curiosity is riding to Mars in the belly of the spacecraft, similar to where an astronaut would be," explains Hassler, RAD's principal investigator. "This means the rover absorbs deep-space radiation storms the same way a real astronaut would."
Even supercomputers have trouble calculating exactly what happens when high-energy cosmic rays and solar energetic particles hit the walls of a spacecraft. One particle hits another; fragments fly; the fragments themselves crash into other molecules.
"It’s very complicated. Curiosity has given us a chance to measure what happens in a real-life situation"
full story
Curiosity Mars Landing
Reply With Quote
Bookmarks