NASA's Mars rover Curiosity could get back to its old rock-drilling ways soon.
A mechanical problem knocked Curiosity's drill, which sits at the end of the rover's 7-foot-long (2 meters) robotic arm, out of commission in late 2016. Mission team members have been studying ways to get the drill back online ever since, and they plan to test a promising work-around this weekend.
Engineers at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California, are tweaking a technique called feed extended drilling (FED), which allows Curiosity to drill in a way similar to how a person might do it. Curiosity will use the force of its arm to push forward into Red Planet rocks as the drill bit spins. And FED will allow Curiosity to apply a hammering force as well, NASA officials said. [Photos: Spectacular Mars Vistas by NASA's Curiosity Rover]
This hammering was key to Curiosity's original drilling technique, allowing the rover to bore 2.5 inches (6.4 centimeters) into rock.
Curiosity will test the new technique, with the percussion component, on Saturday night (May 19), mission team members said. The resulting data will help engineers improve the drilling method over the next few months, the team said.
"This is our next big test to restore drilling closer to the way it worked before," Steven Lee, Curiosity deputy project manager at JPL, said in a statement. "Based on how it performs, we can fine-tune the process, trying things like increasing the amount of force we apply while drilling."
If the new technique allows Curiosity to snag a powdered-rock sample, the engineering team will "immediately begin testing a new process for delivering that sample to the rover's internal laboratories," NASA officials said.
Curiosity has been steadily climbing the foothills of the 3.5-mile-high (5.5 kilometers) Mount Sharp since September 2014, studying the rocks for clues about how and when Mars' climate changed long ago. Such observations are key to the rover's mission, which involves assessing the Red Planet's past potential to host life.
Recently, the rover was making its way uphill along a landform called Vera Rubin Ridge. But last month, mission team members directed Curiosity a bit downhill, toward an area they'd like to sample. This change in direction reflects the team's confidence that Curiosity soon will be able to drill nearly as effectively as it once did.
"We've purposely driven backwards, because the team believes there's high value in drilling a distinct kind of rock that makes up a 200-foot-thick [about 60 m] layer below the ridge," Curiosity project scientist Ashwin Vasavada, also of JPL, said in the same statement. "We're fortunately in a position to drive back a short way and still pick up a target on the top of this layer."