theSIGNAL SCIENCE
25 October 2026
"The cosmos is within us. We are made of star-stuff."
NEWSBUSINESSTECHNOLOGYWORLDSCIENCECULTUREENVIRONMENTSPORT
Science

Half a Gram of Bennu Points to Jupiter

A tiny pinch of asteroid dust, analysed in Zurich, suggests that Jupiter helped shape the raw ingredients of ancient space rocks.

Imagine receiving half a gram of another world in the post. That is roughly the weight of a paperclip. In Zurich, Professor Maria Schönbächler's laboratory at ETH received exactly that: a sliver of asteroid Bennu, delivered from space. The journey began on September 23, 2023, when a NASA capsule dropped into the Utah desert.

Inside were about 120 grams of material scooped from Bennu's surface by the OSIRIS-REx mission. Portions were then shared with laboratories around the globe. Why so careful? Because this dust has barely changed in some 4.

5 billion years. It is a time capsule from the birth of the Solar System. The Zurich team looked at isotopes of three elements: iron, titanium and chromium. Isotopes are versions of the same element with different numbers of neutrons, and their balance acts like a fingerprint.

Bennu's fingerprint turned out to be strikingly similar to that of the asteroid Ryugu and of the CI meteorites, a rare, carbon-rich group that has changed relatively little since the beginning.

Photo: Viktor Talashuk / Unsplash
A sample capsule from the OSIRIS-REx mission rests in the Utah desert after landing
Discuss
  • Why might scientists prefer samples brought back to Earth over studying meteorites that have fallen naturally?
  • Bennu, Ryugu and CI meteorites share one fingerprint. What could this tell us about how far materials travelled?
  • How might Jupiter's enormous gravity have sorted dust and rock in the early Solar System?
Science

Hunting for Life's Mirror Twin

Hold up your hands. They match, yet no rotation will make one fit the other. Molecules can do this too, and almost all life on Earth uses just one "handedness". What if an organism were built from the reverse? Researchers at Strathclyde and Durham propose spotting such mirror life by the left- or right-handed light that special molecules emit. It doesn't exist yet.…
  • Should scientists build detectors for dangers that may never exist?
∞
Isotopes of iron, titanium and chromium give each asteroid a chemical fingerprint that points back to where its ingredients came from.
Maria Schönbächler, Professor of Isotope Geochemistry, ETH Zurich
Science

Words Secretly Prefer Safety Over Danger

Which matters more in a word: how it feels, or how much power and peril it carries? For seventy years, psychologists said feeling. Then Vermont researchers studied billions of uses of 20,000 words and found a different pattern. Meaning, they argue, rests on power, danger and structure, which explained over 90% of variation, against roughly 72% for the old model. Their biggest surprise? We lean toward safe words.…
  • If language leans toward safety, what might that reveal about how humans evolved to communicate?
AMERICAS · Science
Tesla beats earnings projections after Musk floats SpaceX merger plan
EUROPE · Science
40 years later, Chernobyl's nuclear fallout is not what scientists expected
GLOBAL · Science
Astronauts’ hearts just passed a surprising test for Mars
ASIA · Science
India slashes cost of cancer drugs after court rules mark-ups are ‘extortion’
theSIGNAL IN THE LAB
1VOCABULARY
slivertime capsule
isotopesfingerprintbystander
hiding in plain sighthandedness
2GRAMMAR FOCUS
Subjunctive mood — It is essential that he be, I suggest she leave
After verbs and adjectives of recommendation, necessity or demand (suggest, insist, essential, vital), the subjunctive uses the base form of the verb in the that-clause, with no -s in the third person and no tense change. The negative is formed with 'not' before the base verb: 'It is vital that she not forget.'
be · share · not · remain · analyse · study · have
  1. Scientists insist that every portion of the Bennu sample shared with laboratories around the globe.
  2. It is essential that the dust uncontaminated, because it has barely changed in some 4.5 billion years.
  3. Professor Schönbächler's team recommended that the sliver analysed for iron, titanium and chromium isotopes.
  4. It is vital that researchers assume Bennu formed in one place without testing the evidence.
  5. Some astronomers suggest that Jupiter treated as an active sorting machine rather than a bystander.
  6. The Strathclyde and Durham researchers propose that a detector for mirror life built before any such organism appears.
3PHRASAL VERBS
Match the phrasal verb to its definition. All six appear in today’s articles.
  1. to drop into (a place)
  2. to turn out (to be)
  3. to point to
  4. to swing past
  5. to hold up (your hands)
4CRITICAL THINKING
Both the Bennu study and the word-meaning study overturn long-held assumptions after researchers looked at the evidence in a new way. What makes a decades-old theory so hard to dislodge, and who should decide when it is time to abandon it? Think about whether reputation, funding or habit might slow scientific change.
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 Professor Schönbächler writing a short letter to a schoolchild who has asked what it feels like to hold a piece of the early Solar System. Describe the moment the sample arrived and explain, in simple terms, why something so small felt so significant.
7DEGREES OF EXTREMITY
Complete each ladder from mild to strong.
  • unusual→→
  • similar→→
  • old→→
  • tiny→→
  • risky→→
  • doubt→→
8SPEAKING
  1. Which is more exciting to you: exploring space or exploring the deep ocean?
  2. Would you rather make a small discovery alone or share a huge one?
  3. Which scientific idea once seemed absurd but later turned out to be true?
  4. Do words like 'danger' and 'safety' change how you feel about a sentence?