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

Space Turbulence Hides a Magnetic U-Turn

Parker Solar Probe data reveal that the solar wind's magnetic chaos secretly reverses its spin at tiny scales.

Stir milk into coffee and you get beautiful, messy swirls. Now imagine stirring something with no cup, no spoon, and almost no collisions between its parts. That is the puzzle of space turbulence, and it just got stranger. Most matter in space is plasma: a gas of electrically charged particles.

Unlike air or water, plasma reacts strongly to magnetic and electric fields. It is also spread so thinly that its particles rarely bump into each other. So how does energy move through such a system? Scientists have argued about this for decades.

Now an international team has found a clue hiding in plain sight. Using extremely precise measurements from NASA's Parker Solar Probe, researchers from the Technische Universität Braunschweig in Germany and the University of Tokyo in Japan, together with colleagues from Tohoku, Kyushu and Osaka universities and other institutions, spotted something never directly observed before. The turbulent magnetic fields change their direction of rotation at a particular range of small wavelengths. Picture a spiral that suddenly starts twisting the other way.

Photo: Joseph Corl / Unsplash
NASA's Parker Solar Probe flies through the solar wind, measuring magnetic fields close to the Sun.
Discuss
  • Why might plasma behave so differently from air and water when its particles rarely collide with each other?
  • The reversal shifts toward longer wavelengths farther from the Sun. What might explain that change as the solar wind travels?
  • Ten countries took part in this research. How does international collaboration change what scientists can discover and verify?
Science

A Cave Where Only Women Were Buried?

Where are the men? Researchers extracted protein fragments from 23 teeth belonging to at least 20 Homo naledi individuals in South Africa's Rising Star Cave. Not one carried Amelogenin-Y, a marker linked to the male Y chromosome. Scientists from York and Copenhagen suggest the Dinaledi Chamber may be an all-female burial site, perhaps the earliest sex-specific one made by a human relative.…
  • If only females were buried there, what might that reveal about Homo naledi's social lives?
∞
Science

A Virtual Universe Lights Its First Stars

Imagine a cosmos 1.6 billion light-years wide, rebuilt inside a computer. That is Lumina, a simulation by researchers at MIT, Harvard and other institutions, published in MNRAS. It runs through two billion years of history, tracking dark matter, gas, stars and light. Here is the strange part: the early universe was transparent yet dark, because neutral hydrogen swallowed ultraviolet light.…
  • If a simulation can rebuild cosmic dawn, what might it still be missing?
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theSIGNAL IN THE LAB
1VOCABULARY
plasmaturbulence
wavelengthshiding in plain sightreversal
solar windregimes
2GRAMMAR FOCUS
Passive voice — full range (simple, continuous, perfect, modal passive)
The passive is formed with a form of 'be' plus the past participle (e.g. is measured, was found, is being studied, has been observed, can be explained). It is used when the action or the thing affected matters more than who performed it.
is · was · have been · is being · been · can be · were
  1. Most matter in space plasma, a gas of electrically charged particles.
  2. The magnetic reversal had never directly observed before the Parker Solar Probe measurements.
  3. Teeth from at least 20 Homo naledi individuals analysed for protein fragments by researchers from York and Copenhagen.
  4. Right now, the puzzle of space turbulence studied by scientists in ten countries.
  5. Not a single male marker found in any of the 23 teeth.
  6. In the Lumina simulation, dark matter, gas, stars and light tracked across two billion years of cosmic history.
3DEPENDENT PREPOSITIONS
Complete each phrase with the correct preposition. All from today’s articles.
  1. Plasma reacts strongly ___ magnetic and electric fields.
  2. Scientists have argued ___ this question for decades.
  3. The reversal in the magnetic fields was spotted ___ a particular range of small wavelengths.
  4. Researchers link the reversal ___ a critical boundary in the plasma.
  5. None of the 23 teeth carried a marker linked ___ the male Y chromosome.
4CRITICAL THINKING
Two of today's stories rest on indirect evidence: a missing protein marker in teeth, and a computer model of a universe no one can observe. How confident should we be in conclusions drawn from absence or from simulation, and what kind of additional evidence would make you more convinced? Consider which of the two claims seems more vulnerable to being overturned.
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
Choose one of today's three discoveries and imagine explaining it to a ten-year-old in a short paragraph. Use at least one comparison from everyday life, as the first article does with milk and coffee, and end with a question that would make the child want to learn more.
7DEGREES OF EXTREMITY
Complete each ladder from mild to strong.
  • puzzling→→
  • unusual→→
  • thin→→
  • useful→→
  • surprising→→
  • dark→→
8SPEAKING
  1. Which would you rather discover: a hidden pattern in old data, or something brand new?
  2. Scientists argued for decades without an answer. When is it wise to stop arguing?
  3. Is it ever acceptable to disturb an ancient burial site for research?
  4. Would you trust a computer model over direct observation? Why, or why not?