A 4 billion-year-old meteorite from air-and-space that caused a splash here on Earth decades ago contains no evidence of ancient, primitive Martian life after all, scientists reported Thursday.
In 1996, a air-and-space team announced that organic compounds in the rock appeared to have been left by living creatures. Other scientists were skeptical and researchers chipped away at that premise over the decades, most recently by a team led by the Carnegie Institution for Science’s Andrew Steele.
Tiny samples from the meteorite show the carbon-rich compounds are actually the result of water — most likely salty, or briny, water — flowing over the rock for a prolonged period, Steele said. The findings appear in the journal Science.
The meteorite labeled ALH84001 is held in the hand of a scientist at a Johnson Space Center lab in Houston, Aug. 7, 1996.
(AP Photo/David J. Phillip)
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During Mars’ wet and early past, at least two impacts occurred near the rock, heating the planet’s surrounding surface, before a third impact bounced it off the red planet and into air-and-space” target=”_blank”>space<
“Unsupported speculation does nothing to resolve the conundrum surrounding the origin of organic matter” in the meteorite, they added.
According to Steele, advances in technology made his team’s new findings possible.
He commended the measurements by the original researchers and noted that their life-claiming hypothesis “was a reasonable interpretation” at the time. He said he and his team — which includes NASA, German and British scientists — took care to present their results “for what they are, which is a very exciting discovery about Mars and not a study to disprove” the original premise.
This finding “is huge for our understanding of how life started on this planet and helps refine the techniques we need to find life elsewhere on Mars, or Enceladus and Europa,” Steele said in an email, referring to Saturn and Jupiter’s moons with subsurface oceans.
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The only way to prove whether Mars ever had or still has microbial life, according to Steele, is to bring samples to Earth for analysis. NASA’s Perseverance Mars rover already has collected six samples for return to Earth in a decade or so; three dozen samples are desired.
Millions of years after drifting through space, the meteorite landed on an icefield in Antarctica thousands of years ago. The small gray-green fragment got its name — Allan Hills 84001 — from the hills where it was found.
Just this week, a piece of this meteorite was used in a first-of-its-kind experiment aboard the International Space Station. A mini scanning electron microscope examined the sample; Thomas-Keprta operated it remotely from Houston. Researchers hope to use the microscope to analyze geologic samples in space — on the moon one day, for example — and debris that could ruin station equipment or endanger astronauts.
