Reflected light from the half a million satellites expected to launch into Earth\u2019s orbit in the coming years could contaminate not just ground-based imaging, but also almost all the readings taken by space telescopes, NASA astronomers warn. \ud83d\udef0\ufe0f \ud83d\udd2d \ud83d\udcab https:\/\/t.co\/aby1el0n1H<\/a> pic.twitter.com\/euMrMulAtx<\/a><\/p>\n \u2014 AFP News Agency (@AFP) December 3, 2025<\/a> <\/p>\n Yet concerns are mounting. One major issue is light pollution: the glow from thousands of satellites could contaminate almost every image taken by space telescopes. NASA researchers writing in Nature note that since 2019, low-orbit satellites have jumped from 2,000 to 15,000\u2014many of them Starlink. If current plans proceed, the total could hit 560,000 by the late 2030s. Even Hubble, despite its narrow field of view, could see a third of its images degraded.<\/p>\n Did you know<\/p>\n A 100\u2013square meter satellite can appear as bright to the naked eye as the sky\u2019s brightest star. And to meet the growing demands of artificial intelligence<\/a>, designs are being floated for craft as large as 3,000 square meters.<\/p>\n You still don\u2019t see the problem? Imagine trying to spot a potentially hazardous asteroid when what streaks across the sky looks suspiciously like\u2026 a satellite. Lowering satellites beneath space-based instruments might reduce interference\u2014but at the cost of thinning the ozone layer.<\/p>\n #Nature<\/a> Satellite megaconstellations will threaten space-based astronomy https:\/\/t.co\/lEw561rirH<\/a> \u201cif these constellations are completed, one-third of the images of the Hubble Space Telescope will be contaminated, while the SPHEREx, ARRAKIHS and Xuntian space telescopes\u2026\u201d pic.twitter.com\/4wIJamevwj<\/a><\/p>\n \u2014 Francis Villatoro (@emulenews) December 3, 2025<\/a> <\/p>\n Beyond light pollution, a problem of pollution plain and simple<\/p>\n A second worry involves atmospheric contamination from launch fuels and the pollutants released as satellites and rocket stages burn up on reentry. These byproducts spread through nearly every layer of the atmosphere. Launches used to be too infrequent to matter; now, with activity ramping up in Europe, China, Russia, India, Japan, South Korea, and Israel, 2025 could see close to 300 liftoffs.<\/p>\n Scientists admit they don\u2019t yet know how, or how much, this surge is altering the atmosphere\u2014or what it could mean for weather, climate, and life on Earth. Early research indicates that reentry events can inject black carbon into the stratosphere, threatening the ozone layer<\/a>, as a 2022 American Geophysical Union study suggested.<\/p>\n As satellite launches ramp up, experts are increasingly concerned about the emissions from rocket fuels and from satellites burning up on reentry. <\/p>\n \u201cWe are doing something new to the atmosphere that hasn\u2019t been done before,\u201d says a scientist.<\/p>\n Read more: https:\/\/t.co\/ZUlDUPlOor<\/a> pic.twitter.com\/lBeSuYsCsT<\/a><\/p>\n \u2014 Yale Environment 360 (@YaleE360) December 3, 2025<\/a> <\/p>\n The threat of space debris<\/p>\n Another study in PNAS adds a troubling wrinkle: as hardware burns up on reentry, it releases fine aluminum particles that can linger for decades, forming aluminum oxide that also harms ozone. That\u2019s an unintended side effect of \u201cdesign for destruction,\u201d the idea that satellites should burn up rather than clutter orbit. The European Space Agency is therefore considering \u201cdesign for survival\u201d approaches that reduce both space junk and atmospheric harm.<\/p>\n Google\u2019s Project Suncatcher would cluster 81 satellites less than 200 meters apart in one of Earth\u2019s most congested orbits, to create a solar-powered orbiting data center. The hitch? The likelihood of cascading collisions with space debris. https:\/\/t.co\/QZoiPntOWp<\/a><\/p>\n
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