NASA's Mars rover Curiosity has collected samples from deep inside a Red Planet rock for the third time ever.

The 1-ton Curiosity rover bored into a slab of Martian sandstone dubbed Windjana on Monday evening (May 5), creating a hole measuring 0.63 inches (1.6 centimeters) wide and 2.6 inches (6.5 cm) deep, NASA officials said. In the coming days, Curiosity will use its scientific instruments to analyze the powder collected during this drilling operation.

"The drill tailings from this rock are darker-toned and less red than we saw at the two previous drill sites," Jim Bell of Arizona State University, deputy principal investigator for Curiosity's Mast Camera (Mastcam), said in a statement. [Latest Amazing Photos From the Curiosity Rover]
 

"This suggests that the detailed chemical and mineral analysis that will be coming from Curiosity's other instruments could reveal different materials than we've seen before," he added. "We can't wait to find out!"

Windjana test and drilling sites

This image from the Navigation Camera (Navcam) on NASA's Curiosity Mars rover shows two holes at top center drilled into a sandstone target called "Windjana." Image released May 6, 2014. (Image: NASA/JPL-Caltech)

The team chose to drill into Windjana partly to investigate the material that binds sand-size grains together in the rock, NASA officials said. The newly drilled hole is close to a shallow test hole Curiosity dug last week to get a preview of Windjana's interior.
 

In its two previous drilling activities, Curiosity bored into fine-grained mudstones at a site called Yellowknife Bay, which is close to the spot where the rover touched down in August 2012. Analysis of the resulting samples revealed that, billions of years ago, Yellowknife Bay harbored an ancient lake-and-stream environment capable of supporting microbial life.

The Windjana rock is about 2.5 miles (4 kilometers) southwest of Yellowknife Bay, on the way toward the foothills of the towering Mount Sharp, which rises about 3 miles (5 km) into the Martian sky.

The base of Mount Sharp has long been Curiosity's ultimate science destination. Mission team members want the robot to climb up through the mountain's foothills, reading a history of the Red Planet's changing environmental conditions as it goes. Such work could shed light on why and how Mars transitioned from a relatively warm and wet world long ago to the cold, dry place it is today, they have said.

The Windjana sample will be sieved and then delivered to two mini laboratories located on Curiosity's body: the Chemistry and Mineralogy instrument (CheMin) and the Sample Analysis at Mars instrument (SAM).

CheMin and SAM will perform an in-depth analysis of the powder's composition. Some of this work may be performed on the go, as Curiosity continues the long trek toward Mount Sharp, NASA officials said.

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