NASA’s Perseverance rover, which landed in Jezero Crater in February 2021, has retrieved a rock that scientists believe could hold clues to ancient life on Mars. The sample, nicknamed Sapphire Canyon, was taken from the edges of Neretva Vallis, a former river valley that once fed a lake more than three billion years ago.

Why the rock matters

Team member Adrian Broz, a postdoctoral researcher at Purdue University, described the find as the first “potential biosignature” discovered by the mission. The rock, about the size of a chalk stick, displays tiny leopard‑like spots—known as reduction spots—that on Earth form when microbes digest organic material in sediment.

“When there’s organic matter buried in sediment and microbes start to digest it, they create these bleached halos,” Broz explained. “The spots we see on Sapphire Canyon closely resemble those patterns.”

Current status and next steps

The sample remains sealed inside Perseverance’s chassis on the Martian surface. NASA has not yet confirmed a timeline for returning the cache to Earth. After a costly pause and reassessment of the original Mars Sample Return (MSR) program in 2024, the agency is now exploring simpler, more affordable options, including possible commercial or international partnerships.

“We are evaluating a range of potential return options that could offer simpler and more affordable approaches than the original MSR plan,” NASA said in a July statement. No definitive path forward has been announced.

International competition

China is planning its own sample‑return mission, Tianwen‑3, slated for launch in 2028 with a possible retrieval in 2031. If successful, China could become the first nation to bring Martian material back to Earth, potentially offering a different set of rocks for analysis.

Scientific caution

While the spotted rock fuels optimism, researchers stress that definitive proof of past life requires laboratory analysis on Earth. Dr. Briony Horgan of Purdue, a co‑investigator on the Perseverance team, warned that remote observations alone cannot settle the question.

“We can keep studying these hints, but we won’t know for sure until the samples are back in Earth‑based labs,” Horgan said. “Only then can we determine whether life was abundant on Mars or if Earth truly is unique.”

Historical context

The quest to retrieve Martian samples dates back to NASA’s 1978 budget request, following the Viking missions. Over the decades, the MSR concept evolved, with plans shifting from multiple launches to a single integrated mission. By 2022, cost estimates had ballooned to as much as $11 billion, prompting criticism and a reevaluation of the program’s feasibility.

Independent review boards highlighted the complexity and expense, leading NASA to seek less costly alternatives. The agency’s current focus is on finding a path that balances scientific ambition with fiscal responsibility.

Looking ahead

For now, the Sapphire Canyon rock sits quietly on Mars, awaiting a future return mission. Its distinctive spots keep the scientific community hopeful that the Red Planet may one day reveal whether life ever thrived beyond Earth.

Original reporting: KTVZ (Central Oregon) — read the source article.