theSIGNAL SCIENCE
20 August 2026
"The universe is under no obligation to make sense to you."
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Science

The Moon's Far Side: Last Radio Silence

A proposed $150 million telescope on the lunar far side could be humanity's last chance to listen to the cosmos in peace.

In August 1977, a radio telescope in Ohio picked up something extraordinary — a burst of energy from deep space so striking that the astronomer who spotted it scrawled "Wow!" in the margins of the printout. Nearly half a century later, that signal remains unexplained. Here is the unsettling part: if it arrived today, we probably would not even notice it.

Human radio chatter — from satellites, radar, and smartphones — has become so loud that it drowns out the whispers of the universe. That is the problem David DeBoer of the University of Oxford and his colleagues are trying to solve. Their new paper, posted as a preprint on arXiv, proposes a mission called the Lunar Farside Transients and Technology Telescope, or LFT3. The idea is elegant: place a radio antenna on the far side of the Moon, the one place in the solar system that is naturally shielded from Earth's electromagnetic noise.

It has never been done before. And according to DeBoer's team, the window to do it is closing fast. By 2030, a growing fleet of lunar orbiters and landers is expected to introduce permanent radio-frequency interference to the far side. What was once a pristine silence will become just another noisy neighbourhood.

LFT3 would need to arrive before that happens — and the plan is to get it there for just $150 million, using NASA's Commercial Lunar Payload Services programme.

Photo: Nicolas Thomas / Unsplash
Concept art of the proposed Lunar Farside Transients and Technology Telescope, designed to listen to the cosmos from the Moon's shielded far side.
Discuss
  • Why has the 1977 Wow! signal never been satisfactorily explained, and does that matter?
  • Should wealthy nations fund expensive space telescopes when urgent problems exist on Earth?
  • How does radio-frequency interference on Earth illustrate the unintended consequences of technology?
Science

Metal That Floats, Glows, and Bends Like Glass

Tiny beads of nickel-niobium alloy are already orbiting Earth at 400 kilometres up — and they are about to get very, very hot. From 31 August, materials scientist Ralf Busch of Saarland University, Germany, will spend a week remotely melting them aboard the ISS at temperatures reaching 1,700°C, studying the floating droplets without any crucible touching them. Why go to space just to melt metal? On Earth, gravity pulls a liquid droplet out of shape and into its container, which corrupts the measurements. Aboard the ISS, perpetual free-fall creates sustained weightlessness, so the droplets hang still and perfect — ideal for precision data. The material being studied, metallic glass, sounds fragile but is actually stronger than steel. It is also elastic and, when heated, as mouldable as plastic.…
  • Should private companies be allowed to conduct commercial experiments on the ISS?
∞
By 2030, a growing fleet of orbiters and landers will introduce permanent radio-frequency interference to the far side of the moon.
David DeBoer, Research Scientist, University of Oxford
Science

One atom, a mirror, and a big question

Picture a single atom trapped between two mirrors, constantly absorbing and spitting out particles of light. Is that escaping light wasted heat — or can it still do useful work? The answer, it turns out, depends on who is asking: quantum physics or classical physics. Researchers at the University of Basel in Switzerland have built a theoretical framework that gives both fields the same consistent answer.…
  • If even waste heat might be useful, how should we redesign our machines?
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theSIGNAL IN THE LAB
1VOCABULARY
pristineelectromagnetic noise
technosignaturescrucibleweightlessness
preprintmouldable
2GRAMMAR FOCUS
Discourse markers — contrast and concession (Nevertheless, Whereas, Despite, However, Although, Even though, In spite of)
Contrast and concession markers show that two ideas are surprising or unexpected in relation to each other. 'Despite' and 'In spite of' are followed by a noun phrase, whereas 'Nevertheless', 'However', 'Although', and 'Even though' introduce clauses.
Nevertheless · Whereas · Despite · However · Although · Even though · In spite of
  1. The Wow! signal was detected in 1977. , scientists have never been able to explain what caused it.
  2. the far side of the Moon is naturally shielded from Earth's noise, no radio telescope has ever been placed there.
  3. The LFT3 budget is just $150 million. , the mission's scientific targets are extraordinarily ambitious.
  4. the extreme temperature swings on the Moon, the LFT3 telescope is designed to survive roughly 20 weeks of operation.
  5. metallic glass sounds fragile, it is actually stronger than conventional steel.
  6. On Earth, gravity distorts liquid metal droplets. , aboard the ISS the droplets remain perfectly spherical.
3DEPENDENT PREPOSITIONS
Complete each phrase with the correct preposition. All from today's articles.
  1. shielded ___ Earth's electromagnetic noise
  2. scrawled a note ___ the margins
  3. a burst of energy ___ deep space
  4. interference ___ the far side
  5. described ___ Physical Review Letters
4CRITICAL THINKING
The LFT3 team estimates the far side's radio silence will be lost by 2030 due to lunar traffic — yet that same traffic is driven partly by scientific ambition. Does the pursuit of knowledge carry a responsibility to preserve the very conditions that make discovery possible, and who should have the authority to enforce such limits?
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
The articles describe three very different scales of scientific ambition — a telescope scanning the cosmos, a floating metal droplet, and a single trapped atom. Choose two of these and argue which represents the more important frontier of human knowledge, and why scale alone is not a reliable measure of significance.
7DEGREES OF EXTREMITY
Complete each ladder from mild to strong.
  • noticeable→→
  • warm→→
  • quiet→→
  • flexible→→
  • loud→→
  • unusual→→
8SPEAKING
  1. What makes metallic glass more useful than ordinary steel?
  2. How might quantum physics change how we think about energy waste?
  3. Could the Moon ever become as radio-polluted as Earth?
  4. What does free-fall reveal that Earth-based labs simply cannot?