From: fjb@cocks.net   
      
   A Harvard physicist who sounded the alarm earlier this month about a   
   rare interstellar object passing through our solar system — and   
   suggested it might be more than a comet — now says it could even be a   
   nuclear-powered spaceship.   
      
   The object, dubbed 3I/ATLAS, was first detected in early July by an   
   Asteroid Terrestrial-impact Last Alert System (ATLAS) telescope in   
   Chile. It marks only the third time an interstellar object has been   
   observed entering our solar system, according to NASA.   
      
   While NASA classified the object as a comet, Dr. Avi Loeb pointed out   
   that an image showed an unexpected glow in front of the object rather   
   than trailing behind it — something he called "quite surprising."   
      
   In a blog post this week, Loeb wrote that the object’s brightness   
   profile cannot be explained by sunlight reflection or standard cometary   
   outgassing.   
      
   Instead, he suggested, 3I/ATLAS might be generating its own light —   
   possibly from nuclear energy.   
      
   "Alternatively, 3I/ATLAS could be a spacecraft powered by nuclear   
   energy, and the dust emitted from its frontal surface might be from dirt   
   that accumulated on its surface during its interstellar travel," Loeb   
   wrote. "This cannot be ruled out, but requires better evidence to be   
   viable."   
      
   Loeb dismissed other natural power sources. A primordial black hole, he   
   said, would generate only about 20 nanowatts — far too weak. A   
   radioactive fragment from a supernova was highly unlikely given its   
   rarity, and frictional heating from interstellar gas and dust was ruled   
   out by momentum and density constraints.   
      
   That leaves the simplest explanation: a central, compact, high-power   
   source. The most natural way to achieve the gigawatt-level luminosity   
   observed, Loeb noted, would be nuclear power.   
      
   Still, Loeb does not claim the object is nuclear-powered. He stresses   
   there is only one possible interpretation if natural models fail — and   
   proving it would require more evidence.   
      
   3I/ATLAS is estimated at about 20 kilometers across, larger than Manhattan.   
      
   Loeb has also raised questions about its unusual trajectory.   
      
   "If you imagine objects entering the solar system from random   
   directions, just one in 500 of them would be aligned so well with the   
   orbits of the planets," Loeb told Fox News Digital earlier this month.   
      
   The interstellar object, which comes from the center of the Milky Way,   
   is also expected to pass near Mars, Venus, and Jupiter — another   
   improbable coincidence, he said.   
      
   "It also comes close to each of them, with a probability of one in   
   20,000," he said.   
      
   According to NASA, 3I/ATLAS will reach its closest point to the sun —   
   about 130 million miles away — on October 30.   
      
   "If it turns out to be technological, it would obviously have a big   
   impact on the future of humanity," Loeb said. "We have to decide how to   
   respond to that."   
      
   Fox News Digital’s Sophia Compton contributed to this report.   
      
   https://www.msn.com/en-us/news/technology/harvard-physicist-says   
   mysterious-interstellar-object-could-be-nuclear-powered-spaceship/ar-AA1KYTNZ   
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