theSIGNAL SCIENCE
13 November 2026
"The important thing is not to stop questioning. Curiosity has its own reason for existing."
NEWSBUSINESSTECHNOLOGYWORLDSCIENCECULTUREENVIRONMENTSPORT
Science

Two Martian Rocks Hold Life's Favourite Ingredient

Perseverance has confirmed organic carbon in two rocks from Mars's Bright Angel formation, just beneath a surface that usually destroys such molecules.

Two rocks. That is all it took to reopen one of the oldest questions in science. On Mars, in a formation called Bright Angel, NASA's Perseverance rover has found organic carbon, and it was sitting just beneath the surface, where radiation and harsh chemistry should have wrecked it long ago. How do you find a molecule without touching it?

The rover's SHERLOC instrument, mounted on its robotic arm, fires laser light at the rock and reads the way the light scatters. This technique, Raman spectroscopy, maps minerals and organic compounds without damaging the sample. The readings revealed macromolecular carbon: large, interconnected networks of carbon atoms. A study in Science Advances, co-led by Ashley Murphy of the Planetary Science Institute and Kyle Uckert, deputy principal investigator of SHERLOC, now confirms it in the same two rocks that NASA flagged as a potential biosignature in September 2025.

One of them, Cheyava Falls, was also sampled by the rover. Here is the twist, though. Macromolecular carbon is not a fingerprint of life. It turns up in Earth's rocks and in meteorites, and it can form through biology or through chemistry that never involved a living cell.

Photo: Nigel Hoare / Unsplash
Perseverance explores the ancient mudstone of Jezero crater, where river sediment once settled billions of years ago.
Discuss
  • Organic carbon can form with or without life, so why does finding it still excite scientists so much?
  • Why might carbon be better preserved just beneath the Martian surface than directly on top of it?
  • How should scientists communicate a potential biosignature without overstating what the evidence actually proves?
Science

AI Learns to Speak the Brain's Language

What happens when you zap the brain's visual cortex? Often, a blind volunteer sees a flickering blob, and nobody can predict its shape. Researchers from UC Santa Barbara and two other institutions trained a deep learning system to design stimulation patterns, then forecast what participants perceived. The result, published in Neuron, hints that future bionic eyes might learn each brain's private dialect.…
  • Should medical implants adapt to each person's brain, even if that means collecting intimate neural data?
∞
Science

Euclid Counts 900 Million Galaxies, Then Finds Cosmic Lenses

Nine hundred million galaxies. That is the first harvest from Europe's Euclid telescope, which is mapping a third of the sky in sharp detail. Hubble is sharper but sees far less. Hidden in the data are about 15,000 possible gravitational lenses, where one galaxy bends the light of another into glowing rings. Einstein predicted this; dark matter strengthens it.…
  • If dark matter and dark energy remain invisible, how confident can we be they exist?
ASIA · Science
The superpower battle over energy – and what it means for your bills
GLOBAL · Science
Earth's fiery birth may have created hundreds of oceans' worth of water
AFRICA · Science
Where are all the males? Ancient human fossils reveal a startling mystery
AMERICAS · Science
NASA reveals bold new plan to return astronauts to the Moon in 2028
theSIGNAL IN THE LAB
1VOCABULARY
biosignaturemacromolecular carbon
Raman spectroscopymudstonesediment
gravitational lensesdeep learning
2GRAMMAR FOCUS
Reported speech — statements, questions, commands with tense shift
When we report what someone said, we usually shift the tense back (present simple becomes past simple, present perfect becomes past perfect, will becomes would). Reported questions use statement word order and no auxiliary 'do', with 'if' or 'whether' for yes/no questions, while reported commands use 'told/asked + object + (not) to + infinitive'.
had · was · would · if · to · not · were
  1. The researchers explained that the rover found organic carbon just beneath the surface of the rock.
  2. A NASA scientist said that Raman spectroscopy able to map minerals without damaging the sample.
  3. Journalists asked the team the carbon could prove that Mars had once been inhabited.
  4. The study's authors warned that macromolecular carbon not necessarily a fingerprint of life.
  5. One scientist told her colleagues to jump to conclusions about the Bright Angel samples.
  6. The team leader said that the rover sample Cheyava Falls the following week.
3PHRASAL VERBS
Match the phrasal verb to its definition. All six appear in today’s articles.
  1. to reopen a debate or question that had seemed settled (here: 'reopen' is not a phrasal verb, so use) turn up: to appear or be found, often unexpectedly
  2. to settle or become solid at the bottom of a liquid, or to become fixed in place
  3. to be placed or fixed on top of or onto something else
  4. to give a result or account of something by examining it closely (the rover's instrument does this with scattered light)
  5. to point out or mark something as important or worth attention
4CRITICAL THINKING
The Mars article ends with a question the rocks 'are not telling yet': was the carbon delivered, grown, or protected? Choose one of these three explanations and describe what additional evidence a scientist would need to support it over the other two. How would you decide when the evidence is strong enough to change your mind?
5CREATIVE · HEADLINES
Write a headline for the top story in each of the following styles. One line each, no explanation:
  • TABLOID NEWSPAPER
  • LUXURY MAGAZINE
  • ACTIVIST BLOG
6WRITING
Imagine you are the rover's mission scientist and you must write a short, honest diary entry on the day the second rock's results arrive. Describe what you feel, what you refuse to claim yet, and what you would most want to learn next.
7DEGREES OF EXTREMITY
Complete each ladder from mild to strong.
  • surprising→→
  • damaged→→
  • unclear→→
  • interesting→→
  • unlikely→→
  • large→→
8SPEAKING
  1. Would you rather discover life on Mars or understand dark matter first?
  2. Which space mission from history do you think mattered most, and why?
  3. Is spending billions on space science justified when problems exist on Earth?
  4. Should ordinary people be able to vote on how science budgets are spent?