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Fossil-like traces found on Mars—How can we know if this is biological life?

| | February 19, 2018

In early January, NASA’s Curiosity Mars rover came across what some researchers thought might be trace fossils on Mars.

A strictly mineral origin was deemed to be the most plausible. Still, for some, the features suggested bioturbation—a process through which organisms living in sediments can disturb the very structure of those sediments.

[I]f the ongoing work of detecting life proves positive, what protocols are in place to confirm such a verdict?

Jim Green, NASA Planetary Science Division director, said to organize thinking and tackle the topic of direct detection of life elsewhere, NASA and the astrobiology community have crafted what’s tagged as the “Ladder of Life Detection.” The ladder categorizes features that indicate life, ordered from most to least indicative of life, and how they might be discovered.

If something is eventually found that turns out to be biological, [professor Bruce] Jakosky suspects that such a conclusion would not be presented in a grand press conference where the discoverers announce that life has been found.

“The more likely scenario is that it will take multiple analyses by different investigators, and that a consensus will be built up over time as non-biological scenarios are either ruled out or deemed to be less likely,” Jakosky concluded.

Read full, original post: If We Found Life on Mars, How Would We Know?

The GLP aggregated and excerpted this article to reflect the diversity of news, opinion, and analysis. Click the link above to read the full, original article.

1 thought on “Fossil-like traces found on Mars—How can we know if this is biological life?”

  1. Ever see drying mud leave a pattern of intersecting cracks?
    Sure you have.
    Imagine, now, that said cracks in the mud get filled in by a coarse and heavy granular junk; sand and grit.
    The heavy grit stays put as the dried mud, being essentially dust without water, is swept away by the winds.
    You are left with ‘squiggles’ that look like worm-tracks, crystal boundaries or back-filled mud-cracks.
    Simplest explanation is best, mud-cracks for the win, boys!

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