.png)
In June 2024, astronomers discovered a mysterious, intense burst of radio waves coming from within our galaxy. Initially, they assumed it was coming from a pulsar or some unknown cosmic object. However, investigation found that the signal's origin was too close to Earth. Astronomers believe it was created by the long-dead NASA spacecraft Relay 2, which was launched in 1964 but stopped operating in 1967 after its communication systems failed. However, over 60 years later, it inexplicably transmitted a strong radio signal, according to the researchers in a new preprint article published on the arXiv service on June 13 and not yet peer-reviewed.
Relay 2: A silent satellite sends a loud signal
According to the report, the signal was identified with the Australian Square Kilometre Array Pathfinder (ASKAP) telescope array. These strong flashes often come from deep space and can convey more energy in milliseconds than the sun does in several days.
However, this signal, which lasted only 30 nanoseconds, was tracked back to Earth, making it too near for ASKAP to see properly. After eliminating out cosmic causes, the scientists tracked the pulse to Relay 2's orbit. Despite having no operational systems, the satellite produced the brightest radio flash in the sky at the time.
Researchers presented two theories: a micrometeorite collision that resulted in a radio-emitting plasma cloud, or an electrostatic discharge (ESD) generated by charge accumulation on the satellite's aging components.
New Clues About Spacecraft Behavior and Debris
Although both techniques might provide comparable signals, experts believe electrostatic discharge is the most likely source. According to space physicists, older spacecraft, such as Relay 2, may be more vulnerable to such energy discharges because to obsolete materials and poor shielding.
Karen Aplin told New Scientist that monitoring these unintended discharges might assist monitor ESD incidents on today's tiny spacecraft, which sometimes lack adequate shielding. In an increasingly congested orbital environment, this detection technology may provide a new tool for assessing space debris and satellite health.
