theSIGNAL SCIENCE
22 June 2026
"The sea does not reward those who are too anxious, too greedy, or too impatient."
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Science

El Niño Returns — and a Satellite Saw It Coming

A joint NASA–ESA satellite caught the first ripples of El Niño months before forecasters made it official, revealing how ocean height tells the temperature story.

On June 8, 2026, a map lit up in red. The colours were not a warning — they were a measurement. Three days before the United States' National Oceanic and Atmospheric Administration officially declared an El Niño event, NASA's Jet Propulsion Laboratory was already watching warm water bulge across the central and eastern Pacific Ocean. The instrument doing the watching was the Sentinel-6 Michael Freilich satellite, a joint project between NASA and the European Space Agency launched in 2020.

Its data revealed something quietly astonishing: you can feel an El Niño approaching not just by measuring temperature, but by measuring height. Here is the physics behind that idea. When seawater warms, it expands. It quite literally takes up more space, which causes the ocean's surface to rise.

So a satellite that measures sea surface height is, in effect, reading the ocean's temperature from space.

Photo: nemo / Unsplash
A NASA map from June 8, 2026 shows elevated sea surface heights across the central and eastern Pacific, three days before El Niño was declared officially.
Discuss
  • How does measuring sea surface height allow scientists to infer ocean temperature from space?
  • El Niño brings rain to some regions and drought to others — is any country truly 'safe' from its effects?
  • Should wealthy nations with advanced satellites share their early-warning data freely with vulnerable countries? Why or why not?
  • What role do trade winds play in triggering El Niño, and what might cause those winds to weaken?
  • If El Niño events become stronger due to climate change, how should governments in the western Pacific prepare differently?
Science

Our Germs Could Conquer Mars

Here is an unsettling twist: the danger in space travel might not be what we bring back — it is what we bring there. Radboudumc researcher Tommaso Zaccaria exposed Earth microorganisms to simulated Martian conditions at Germany's DLR aerospace centre, and many survived. Yeasts thrived by turbocharging their own DNA repair systems. …
  • Should spacecraft be held to stricter sterilisation standards before leaving Earth?
∞
"Warm water piles up in the east, deepening the warm surface layer, lowering the thermocline."
NASA Jet Propulsion Laboratory scientists, as cited by NASA Earth Observatory
Science

Real Numbers Can Do Quantum's Job

Here is a strange question: does the universe actually need imaginary numbers to exist? Since the 1900s, physicists from Max Planck to Erwin Schrödinger have used complex numbers — with their mysterious imaginary parts — to describe quantum particles. A 2021 study insisted those imaginary numbers were essential. …
  • Are imaginary numbers a human invention or a feature of reality?
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theSIGNAL IN THE LAB
1VOCABULARY
bulgeconsecutive
turbochargingthresholdsimulated
restrictivedrenches
2GRAMMAR FOCUS
Reported speech — statements, questions, commands with tense shift
When reporting what someone said, thought, or asked, verbs shift back one tense (e.g. 'is' becomes 'was', 'can' becomes 'could', 'will' becomes 'would'). Question word order also changes to standard subject-verb order.
was · could · would · had survived · were · had begun · had remained
  1. NASA's Jet Propulsion Laboratory reported that warm water bulging across the central and eastern Pacific Ocean before the official declaration.
  2. NOAA confirmed that sea surface temperatures above their long-term average for several consecutive months.
  3. Scientists explained that half a degree of warming redirect monsoons and reshape weather patterns for a billion people.
  4. The researchers announced that Kelvin waves rolling eastward from the western Pacific earlier in spring 2026.
  5. Zaccaria reported that many Earth microorganisms after exposure to simulated Martian conditions.
  6. The study warned that pathogens like Klebsiella pneumoniae alive even after shrinking during the simulated journey.
  7. Professor Bruß and her colleague argued that real numbers alone describe quantum mechanics perfectly well.
3COLLOCATIONS
Match the verb on the left with the noun phrase it best collocates with on the right.
  1. declare
  2. redirect
  3. turbocharge
  4. shrink
  5. weaken
  6. reshape
4CRITICAL THINKING
Kelvin waves hundreds of miles wide can be detected by a single satellite, yet their downstream effects — droughts, floods, failed harvests — fall hardest on communities with the least ability to respond. Does the growing precision of our ability to predict such events make our collective failure to act on those predictions more, or less, defensible?
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
All three articles describe something small — a half-degree of warmth, a shrunken microbe, a replaced mathematical assumption — producing consequences far larger than the original change. Choose one of these examples and argue, in a structured paragraph, whether science should communicate such disproportionate relationships more boldly to the public.
7DEGREES OF EXTREMITY
Complete each ladder from mild to strong.
  • warm→→
  • unusual→→
  • damp→→
  • shrink→→
  • concerned→→
  • weaken→→
  • odd→→
8SPEAKING
  1. Could a microbe from Earth ever become truly Martian over time?
  2. What does Kelvin waves' enormous scale tell us about ocean energy?
  3. Is 0.5°C a dangerously misleading threshold for declaring El Niño?
  4. Do astronauts deserve to know every biological risk before launch?
  5. If real numbers replace imaginary ones, does physics become simpler or stranger?