First of two Robot Mars Rovers Takes Off
NASA: The first of two Mars Rovers, named Spirit, has taken off to Mars Launched at 1:58 p.m. US-EDT. Spirit will take
seven months to reach Mars. The second Rover, named Opportunity, is scheduled to launch on June 25.
NASA's Mars Exploration Rover (MER) project kicks off by launching the first of two unique robotic geologists. The
identical rolling rovers see sharper images, can explore farther and examine rocks better than anything that's ever
landed on Mars. The second rover mission, bound for a different site on Mars, will launch as soon as June 25.
"The instrumentation onboard these rovers, combined with their great mobility, will offer a totally new view of Mars,
including a microscopic view inside rocks for the first time," said Dr. Ed Weiler, associate administrator for space
science, NASA Headquarters, Washington. "However, missions to Mars have proven to be far more hazardous than missions to
other planets. Historically, two out of three missions, from all countries who have tried to land on Mars, ended in
failure. We have done everything we can to ensure our rovers have the best chance of success," Weiler said.
The first MER will arrive at Mars on Jan. 4, 2004, the second, Jan. 25. Plans call for each to operate for at least
three months. These missions continue NASA's quest to understand the role of water on Mars. "We will be using the rovers
to find rocks and soils that could hold clues about wet environments of Mars' past," said Dr. Cathy Weitz, MER Rover
program scientist at NASA Headquarters. "We'll analyze the clues to assess whether those environments may have been
conducive to life."
First, the rovers have to safely reach Mars. "The rovers will use innovations to aid in safe landings, but risks
remain," said Peter Theisinger, MER project manager at NASA's Jet Propulsion Laboratory (JPL), Pasadena, Calif.
The rovers will bounce to airbag-cushioned landings at sites offering a balance of favorable conditions for safe
landings and interesting science. The designated site for the first mission is Gusev Crater. The second rover will go to
a site called Meridiani Planum. "Gusev and Meridiani give us two different types of evidence about liquid water in Mars'
history," said Dr. Joy Crisp, MER project scientist at JPL. "Gusev appears to have been a crater lake. The channel of an
ancient riverbed indicates water flowed right into it. Meridiani has a large deposit of gray hematite, a mineral that
usually forms in a wet environment," Crisp said.
The rovers, working as robotic field geologists, will examine the sites for clues about what happened there. "The clues
are in the rocks, but you can't go to every rock, so you split the job into two pieces," said Dr. Steve Squyres of
Cornell University, Ithaca, N.Y., principal investigator for the package of science instruments on the rovers.
First, a panoramic camera at human-eye height, and a miniature thermal emission spectrometer, with infrared vision, help
scientists identify the most interesting rocks. The rovers can watch for hazards and maneuver around them. Each
six-wheeled robot has a deck of solar panels, about the size of a kitchen table, for power. The rover drives to the
selected rock and extends an arm with tools on the end. Then, a microscopic imager, like a geologist's hand lens, gives
a close-up view of the rock's texture. Two spectrometers identify the composition of the rock. The fourth tool
substitutes for a geologist's hammer. It exposes the fresh interior of a rock by scraping away the weathered surface
layer.
Both rover missions will lift off from Cape Canaveral Air Force Station, Fla., on Delta II launch vehicles. Launch
opportunities begin for the first mission at 2:06 p.m. (EDT) June 8 and for the second mission at 12:38 a.m. (EDT) June
25, and repeat twice daily, for up to 21 days, for each mission.
"We see the twin rovers as stepping stones for the rest of the decade and to a future decade of Mars exploration that
will ultimately provide the knowledge necessary for human exploration," said Orlando Figueroa, director of the Mars
Exploration Program at NASA Headquarters. JPL, a division of the California Institute of Technology in Pasadena, manages
the MER Project for NASA's Office of Space Science, Washington.