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Rover hits 'a jackpot' in quest for signs of water on Mars

AFP/Getty Images
This NASA handout image released January 15, 2013, taken by The right Mast Camera (Mastcam) of NASA's Curiosity Mars rover provided this view of the lower stratigraphy at 'Yellowknife Bay' inside Gale Crater on Mars. The rectangle superimposed on the left image shows the location of the enlarged portion on the right. In the right image, white arrows point to veins (including some under the overhang), and black arrows point to concretions (small spherical concentrations of minerals). Both veins and concretions strongly suggest precipitation of minerals from water. AFP PHOTO / NASA/JPL-Caltech/MSSSHO/AFP/Getty Images

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'American Coyotes' Series

Traveling by Jeep, boat and foot, Tribune-Review investigative reporter Carl Prine and photojournalist Justin Merriman covered nearly 2,000 miles over two months along the border with Mexico to report on coyotes — the human traffickers who bring illegal immigrants into the United States. Most are Americans working for money and/or drugs. This series reports how their operations have a major impact on life for residents and the environment along the border — and beyond.

By The Christian Science Monitor
Sunday, Jan. 20, 2013, 8:08 p.m.
 

White veins of minerals coursing through rocks on the floor of Mars' Gale Crater are providing some of the strongest evidence yet that the rover Curiosity's landing site once was a wetter, warmer place.

The details are still fuzzy. But the composition of the minerals indicate that they precipitated out of water flowing through fissures in the rock, while large grains within the rocks themselves are rounded, suggesting that water might have dulled their sharp edges.

Yellowknife Bay, the rocky expanse Curiosity inhabits, “is literally shot through with these fractures,” said John Grotzinger, a geologist at the California Institute of Technology in Pasadena., Calif., and the mission's chief scientist.

It features abundant, berry-shaped spherules that scientists said are sedimentary concretions formed in and worked over by water.

All together, “basically these rocks were saturated with water,” Grotzinger explained during a briefing this month outlining the rover's latest exploits.

Yellowknife Bay represents “a jackpot unit,” he said. Initially, researchers thought they might have to drive Curiosity up on the shoulders of Mt. Sharp, a towering summit in the middle of the crater, to find such a trove.

Curiosity, a one-ton geochemistry lab on wheels, landed on Mars in August. Its goal is to determine whether the crater at one time could have been hospitable for simple forms of organic life.

A layered, rock outcrop the team has named the Shaler Unit indicates a stream flowed through the area, shifting small sediment dunes on the stream bed in ways that formed the layers. The composition of the white minerals in rock veins is consistent with calcium sulfate, plus a fair bit of hydrogen. The relatively high levels of hydrogen suggest the minerals precipitated out of water flowing through the fissures.

The mineral-filled fissures looked similar to those found in rocks in the Sahara.

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