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Lifeless NASA satellite tv for pc unexpectedly emits highly effective radio pulse

June 20, 2025
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Lifeless NASA satellite tv for pc unexpectedly emits highly effective radio pulse
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An illustration of NASA’s Relay 1 satellite tv for pc, the precursor to Relay 2

NASA

A satellite tv for pc that had been useless for many years out of the blue blasted out a robust radio pulse that briefly outshone each different object within the sky. Astronomers suppose the flash could have been attributable to a freak micrometeorite affect or a random spark.

NASA’s Relay 2 satellite tv for pc was one of many first functioning satellites, launched in 1964 as an experimental communications gadget. NASA stopped utilizing it the next 12 months, nevertheless, and the satellite tv for pc’s onboard electronics stopped working altogether by 1967, leaving the useless steel hull to orbit Earth indefinitely.

So Clancy James at Curtin College in Australia and his colleagues had been perplexed when, almost 60 years later, they detected a quick, highly effective burst of radio waves coming from the satellite tv for pc’s obvious location.

James and his staff had been scanning the sky with the Australian Sq. Kilometre Array Pathfinder (ASKAP), an array of 36 radio telescopes in Western Australia, for indicators of quick radio bursts, mysterious pulses of radiation that come from different galaxies.

On 13 June final 12 months, they noticed a sign that gave the impression to be coming from inside our galaxy. “If it’s close by, we will examine it by way of optical telescopes actually simply, so we received all excited, considering perhaps we’d found a brand new pulsar or another object,” says Clancy.

However on additional inspection, the sign gave the impression to be so near Earth that ASKAP couldn’t focus all of its telescopes without delay – like how a telephone digicam struggles to deal with close by objects. This meant it should have come from inside 20,000 kilometres of Earth, says Clancy. The researchers additionally discovered that the sign was very brief lived, lasting lower than 30 nanoseconds. “This was an extremely highly effective radio pulse that vastly outshone every little thing else within the sky for a really brief period of time,” says Clancy.

Once they traced the sign to the place it got here from and in contrast it with recognized satellite tv for pc positions within the sky, they discovered only one believable clarification – the Relay 2 satellite tv for pc. Because the satellite tv for pc is now not practical, Clancy and his staff suppose it should have come from an exterior occasion, equivalent to an electrostatic discharge – a build-up of electrical energy that ends in a spark-like flash – or a micrometeorite that struck the satellite tv for pc and produced a cloud of charged plasma.

It might be very tough to distinguish between these two eventualities, says Karen Aplin on the College of Bristol, UK, because the radio sign produced by each would look comparable. Nonetheless, it might be helpful to watch future electrostatic discharges from satellites, she says. “In a world the place there may be plenty of area particles and there are extra small, low-cost satellites with restricted safety from electrostatic discharges, this radio detection could finally provide a brand new approach to judge electrostatic discharges in area,” she says.

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