\u201cThese are incredibly powerful explosions in radio (waves) that last about a millisecond,\u201d James said. \u201cWe don\u2019t know what\u2019s producing them, and we\u2019re trying to find out, because they really challenge known physics \u2014 they\u2019re so bright. We\u2019re also trying to use them to study the distribution of matter<\/a> in the universe.\u201d<\/p>\n Astronomers believe these bursts may come from magnetars, according to James. These objects are very dense remnants of dead stars with powerful magnetic fields. \u201cMagnetars are utterly, utterly insane,\u201d James said. \u201cThey\u2019re the most extreme things you can get in the universe before something turns into a black hole.\u201d<\/p>\n But the signal seemed to be coming from very close to Earth \u2014 so close that it couldn\u2019t be an astronomical object. \u201cWe were able to work out it came from about 4,500 kilometers (2,800 miles) away. And we got a pretty exact match for this old satellite called Relay 2 \u2014 there are databases that you can look up to work out where any given satellite should be, and there were no other satellites anywhere near,\u201d James said.<\/p>\n \u201cWe were all kind of disappointed at that, but we thought, \u2018Hang on a second. What actually produced this anyway?\u2019\u201d<\/p>\n A massive short-circuit<\/p>\n NASA launched Relay 2<\/a>, an experimental communications satellite, into orbit in 1964. It was an updated version of Relay 1<\/a>, which lifted off two years earlier and was used to relay signals between the US and Europe and broadcast the 1964 Summer Olympics in Tokyo.<\/p>\n Just three years later, with its mission concluded and both of its main instruments out of order, Relay 2 had already turned into space junk. It has since been aimlessly orbiting our planet, until James and his colleagues linked it to the weird signal they detected last year.<\/p>\n But could a dead satellite suddenly come back to life after decades of silence?<\/p>\n To try to answer that question, the astronomers wrote a paper<\/a> on their analysis, set to publish Monday in the journal The Astrophysical Journal Letters.<\/p>\n They realized the source of the signal wasn\u2019t a distant galactic anomaly, but something close by, when they saw that the image rendered by the telescope \u2014 a graphical representation of the data \u2014 was blurry.<\/p>\n Shown above is the blurry image that left the astronomers scratching their heads, with the signal as a bright spot in the center. – Marcin Glowacki<\/p>\n \u201c(T)he reason we were getting this blurred image was because (the source) was in the near field of the antenna \u2014 within a few tens of thousands of kilometers,\u201d James said. \u201cWhen you have a source that\u2019s close to the antenna, it arrives a bit later on the outer antennas, and it generates a curved wave front, as opposed to a flat one when it\u2019s really far away.\u201d<\/p>\n This mismatch in the data between the different antennas caused the blur, so to remove it, the researchers eliminated the signal coming from the outer antennas to favor only the inner part of the telescope, which is spread out over about 2.3 square miles in the Australian outback.<\/p>\n \u201cWhen we first detected it, it looked fairly weak. But when we zoomed in, it got brighter and brighter. The whole signal is about 30 nanoseconds, or 30 billionths of a second, but the main part is just about three nanoseconds, and that\u2019s actually at the limit of what our instrument can see,\u201d James said. \u201cThe signal was about 2,000 or 3,000 times brighter than all the other radio data our (instrument) detects \u2014 it was by far the brightest thing in the sky, by a factor of thousands.\u201d<\/p>\n The researchers have two ideas on what could have caused such a powerful spark. The main culprit was likely a buildup of static electricity on the satellite\u2019s metal skin, which was suddenly released, James said.<\/p>\n \u201cYou start with a buildup of electrons on the surface of the spacecraft. The spacecraft starts charging up because of the buildup of electrons. And it keeps charging up until there\u2019s enough of a charge that it short-circuits some component of the spacecraft, and you get a sudden spark,\u201d he explained. \u201cIt\u2019s exactly the same as when you rub your feet on the carpet and you then spark your friend with your finger.\u201d<\/p>\n A less likely cause is the impact of a micrometeorite, a space rock no bigger than 1 millimeter (0.039 inches) in size: \u201cA micrometeorite impacting a spacecraft (while) traveling at 20 kilometers per second or higher will basically turn the (resulting) debris from the impact into a plasma \u2014 an incredibly hot, dense gas,\u201d James said. \u201cAnd this plasma can emit a short burst of radio waves.\u201d<\/p>\n However, strict circumstances would need to come into play for this micrometeorite interaction to occur, suggesting there\u2019s a smaller chance it was the cause, according to the research. \u201cWe do know that (electrostatic) discharges can actually be quite common,\u201d James said. \u201cAs far as humans are concerned, they\u2019re not dangerous at all. However, they absolutely can damage a spacecraft.\u201d<\/p>\n NASA launched communications satellite Relay 2 in 1964. Three years later, Relay 2’s mission was over. – NASA<\/p>\n A risk of confusion<\/p>\n Because these discharges are difficult to monitor, James believes the radio signal event shows that ground-based radio observations could reveal \u201cweird things happening to satellites\u201d \u2014 and that researchers could employ a much cheaper, easier-to-build device to search for similar events, rather than the sprawling telescope they used. He also speculated that because Relay 2 was an early satellite, it might be that the materials it\u2019s made of are more prone to a buildup of static charge than modern satellites, which have been designed with this problem in mind.<\/p>\n But the realization that satellites can interfere with galactic observations also presents a challenge and adds to the list of threats posed by space junk<\/a>. Since the dawn of the Space Age, almost 22,000 satellites have reached orbit, and a little more than half are still functioning. Over the decades, dead satellites have collided hundreds of times<\/a>, creating a thick field of debris and spawning millions of tiny fragments that orbit at speeds of up to 18,000 miles per hour<\/a>.<\/p>\n \u201cWe are trying to see basically nanosecond bursts of stuff coming at us from the universe, and if satellites can produce this as well, then we\u2019re going to have to be really careful,\u201d James said, referring to the possibility of confusing satellite bursts with astronomical objects. \u201cAs more and more satellites go up, that\u2019s going to make this kind of experiment more difficult.\u201d<\/p>\n James and his team\u2019s analysis of this event is \u201ccomprehensive and sensible,\u201d according to James Cordes, Cornell University\u2019s George Feldstein Professor of Astronomy, who was not involved with the study. \u201cGiven that the electrostatic discharge phenomenon has been known for a long time,\u201d he wrote in an email to CNN, \u201cI think their interpretation is probably right. I\u2019m not sure that the micrometeoroid idea, pitched in the paper as an alternative, is mutually exclusive. The latter could trigger the former.\u201d<\/p>\n Ralph Spencer, Professor Emeritus of Radio Astronomy at the University of Manchester in the UK, who was also not involved with the work, agrees that the proposed mechanism is feasible, noting that spark discharges from GPS satellites have been detected before.<\/p>\n The study illustrates how astronomers must take care to not confuse radio bursts from astrophysical sources with electrostatic discharges or micrometeoroid bursts, both Cordes and Spencer pointed out.<\/p>\n \u201cThe results show that such narrow pulses from space may be more common than previously thought, and that careful analysis is needed to show that the radiation comes from stars and other astronomical objects rather than man-made objects close to the Earth,\u201d Spencer added in an email.<\/p>\n \u201cNew experiments now in development, such as the Square Kilometre array Low frequency array (SKA-Low<\/a>) being built in Australia, will be able to shed light on this new effect.\u201d<\/p>\n Clarification: This story has been updated to clarify the time frame in which the strange radio signal was detected.<\/p>\n![\"Shown](\"https:\/\/www.europesays.com\/uk\/wp-content\/uploads\/2025\/07\/cdcf7d15cdb459b15fa7793d526ac0b0.jpeg\"\/)
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