{"id":112958,"date":"2026-08-22T00:41:40","date_gmt":"2026-08-22T00:41:40","guid":{"rendered":"https:\/\/youzum.net\/this-companys-plans-to-deploy-space-mirrors-could-jeopardize-the-night-sky-for-many\/"},"modified":"2026-08-22T00:41:40","modified_gmt":"2026-08-22T00:41:40","slug":"this-companys-plans-to-deploy-space-mirrors-could-jeopardize-the-night-sky-for-many","status":"publish","type":"post","link":"https:\/\/youzum.net\/zh\/this-companys-plans-to-deploy-space-mirrors-could-jeopardize-the-night-sky-for-many\/","title":{"rendered":"This company\u2019s plans to deploy space mirrors could jeopardize the night sky for many"},"content":{"rendered":"<div data-chronoton-summary=\"&lt;ul&gt;&lt;br&gt;&lt;li&gt;&lt;strong&gt;Space mirrors are coming:&lt;\/strong&gt; A private company is moving forward with plans to launch reflective satellites into orbit, raising alarms among astronomers and stargazers worldwide.&lt;\/li&gt;&lt;br&gt;&lt;li&gt;&lt;strong&gt;The night sky at risk:&lt;\/strong&gt; The mirrors could dramatically brighten the sky, potentially disrupting astronomical research and robbing people of natural darkness.&lt;\/li&gt;&lt;br&gt;&lt;li&gt;&lt;strong&gt;No one asked:&lt;\/strong&gt; Critics argue that no single company should have the power to alter something as universal as the night sky without broader public consent or regulatory oversight.&lt;\/li&gt;&lt;\/ul&gt;&lt;br&gt;\" data-chronoton-post-id=\"1142755\" data-chronoton-expand-collapse=\"1\" data-chronoton-analytics-enabled=\"1\"><\/div>\n<p>A company that plans to beam sunlight from space to Earth on demand might unintentionally brighten the night sky for many more people than intended, according to a new study.<\/p>\n<p>Later this year, the US company Reflect Orbital plans to launch a test satellite called E\u00e4rendil-1 that will extend an 18-by-18-meter mirror in orbit. The goal is to test the feasibility of the company\u2019s plans to launch up to 50,000 larger satellites, measuring 54 by 54 meters, and reflect sunlight to Earth on demand.<\/p>\n<p>The case for doing this remains somewhat uncertain, but Reflect Orbital has said the goal is to prolong the hours of sunlight for various uses, including solar panel charging, emergency response, and military activities.<\/p>\n<p>The launch, which was <a href=\"https:\/\/spacenews.com\/fcc-approves-first-reflect-orbital-satellite\/\">approved by the Federal Communications Commission in July<\/a>, has been met with disbelief by astronomers and environmental groups. \u201cThis is incompatible with astronomy,\u201d says Samantha Lawler, an astronomer at the University of Regina in Canada. \u201cThere is no way you can do this and preserve dark skies.\u201d<\/p>\n<p>Miroslav Kocifaj, an astronomer at the Slovak Academy of Sciences, and his colleagues have now calculated the broader effect on the night sky. In a new paper <a href=\"https:\/\/arxiv.org\/abs\/2608.06433\">published online<\/a> and accepted for publication in the space journal <em>Astrophysical Journal Letters<\/em>, they studied the extent to which the light the satellites beamed to the ground would scatter.<\/p>\n<p>They found that within the beam\u2019s target area, intended to be a circular patch five kilometers across, a single Reflect Orbital satellite would appear about 40 times brighter than the full moon in the sky. As far as 14 kilometers away from the center of the beam, the satellite would still be as bright as the full moon.\u00a0<\/p>\n<p>Combining the beams of 400 satellites, which Reflect Orbital eventually plans to do, would yield a light as bright as 10,000 full moons within the five-kilometer area, or 2.4% as bright as the sun. Even up to 80 kilometers away, Kocifaj and his colleagues calculated, this combined beam would be visible as \u201ca glow above the horizon,\u201d he says. That means the night sky would be altered for many more people than those within the area Reflect Orbital intends to illuminate.<\/p>\n<p>\u201cDeploying these mirrors would be seriously damaging for astronomy and for the nighttime environment,\u201d says Kocifaj.\u201c The damage extends far beyond the target area.\u201d<\/p>\n<p>Olivier Hainaut, an astronomer at the European Southern Observatory in Germany, says the results of the paper are not surprising but are still useful. \u201cThese guys are really good at that kind of modeling,\u201d he says. \u201cThey know what they\u2019re doing.\u201d<\/p>\n<p>Hainaut had previously modeled the broader effect of Reflect Orbital\u2019s beams, finding they would brighten the sky <a href=\"https:\/\/arxiv.org\/abs\/2604.09427\">up to 300%<\/a> worldwide. This latest work gives an even more complete picture of what the impact would be. \u201cThese two papers really cover most of it,\u201d he says.<\/p>\n<p>Reflect Orbital CEO Ben Nowack disagrees with the findings of Kocifaj\u2019s paper. \u201cSome assumptions are simply inaccurate,\u201d he says. \u201cThe critical point is that our safeguards, including maintaining exclusion zones, take account of scattering.\u201d<\/p>\n<p>He says that the company has \u201cengaged substantively with legitimate concerns raised by astronomers, environmental researchers, and scientists,\u201d and that their feedback has \u201cinformed our technology and operational plans.\u201d<\/p>\n<p>Kocifaj says that Reflect Orbital has not provided data to back up its claims. The company \u201cstates that safeguards exist, that scattering is taken into account, and that the models are being updated, but it gives no numbers, no description of the model, no assumptions, and no data,\u201d he says. \u201cThere is therefore nothing that can be engaged with technically. Our calculations produce concrete figures.\u201d<\/p>\n<p>Reflect Orbital\u2019s intention is to place its satellites into highly inclined orbits above Earth, almost from pole to pole. This will enable them to reflect sunlight in the hours before sunrise and after sunset, extending daylight hours in certain locations. Eventually, the company has said, it wants to place satellites high enough to <a href=\"https:\/\/aas.org\/action-alert-provide-input-fcc-proposed-satellite-systems\">provide light 24-7<\/a> to locations on Earth.<\/p>\n<p>In August, a group of organisations including DarkSky International and the American Bird Conservancy urged the FCC to <a href=\"https:\/\/darksky.org\/news\/darksky-and-allies-ask-the-fcc-to-reverse-its-approval-of-the-reflect-orbital-space-mirror\/\">review its approval<\/a> of the E\u00e4rendil-1 satellite. As well as the impact on astronomy raised by this and future satellites, the group also highlighted potential negative consequences for aviation and wildlife.<\/p>\n<p>\u201cOur primary request is straightforward: Reverse the Space Bureau\u2019s order, and require a lawful public-interest and NEPA [National Environmental Policy Act] review,\u201d the group said <a href=\"https:\/\/darksky.org\/news\/darksky-and-allies-ask-the-fcc-to-reverse-its-approval-of-the-reflect-orbital-space-mirror\/\">in a statement<\/a>.<\/p>\n<p>The satellites could also pose risks to humans, according to Reflect Orbital itself. In a <a href=\"https:\/\/aas.org\/sites\/default\/files\/2026-03\/Reflect%20Orbital_EARENDIL-1_Consolidated%20Opposition%20and%20Reply_FINAL_03242026_0.pdf\">filing with the FCC<\/a> in March, the company said that observing E\u00e4rendil-1 with a telescope larger than 12 inches \u2014which many astronomers have access to\u2014may <a href=\"https:\/\/gizmodo.com\/this-satellite-is-so-bright-it-could-fry-your-retinas-through-a-telescope-2000797578\">be unsafe<\/a> for human eyes. It added, though, that such observations are \u201cunlikely to \u2026 result in significant injury\u201d because the satellites are not constantly bright.<\/p>\n<p>Currently there is no global entity that could regulate satellites such as these, so approval falls to national regulators such as the FCC in the US. Michelle Hanlon, a space lawyer at the University of Mississippi\u2019s School of Law, says there are \u201creal benefits\u201d to the plans proposed by Reflect Orbital. \u201cIt could extend the productive hours of solar facilities and provide light in remote areas or after a disaster,\u201d she says.<\/p>\n<p>However, the \u201clegal basis is less clear than the technology,\u201d she says. The FCC \u201cdoes not have authority to license or regulate the operation of the solar reflector itself.\u201d It can only authorize the use of radio frequencies to communicate with the spacecraft.<\/p>\n<p>That means Reflect Orbital will need permission on a national and local level to reflect sunlight onto the ground, but if the beams spread as much as Kocifaj and his team predict, \u201cthe company could need approvals in more than one jurisdiction,\u201d says Hanlon. \u201cThere may also be aviation-safety and cross-border questions.\u201d<\/p>\n<p>The fierce debate over the satellites shows no signs of abating. \u201cIt makes me sad that astronomers are having to spend their time doing these sorts of calculations rather than actually doing astronomy,\u201d says Lawler. \u201cThis is not what we want to spend our time on.\u201d<\/p>","protected":false},"excerpt":{"rendered":"<p>A company that plans to beam sunlight from space to Earth on demand might unintentionally brighten the night sky for many more people than intended, according to a new study. Later this year, the US company Reflect Orbital plans to launch a test satellite called E\u00e4rendil-1 that will extend an 18-by-18-meter mirror in orbit. The goal is to test the feasibility of the company\u2019s plans to launch up to 50,000 larger satellites, measuring 54 by 54 meters, and reflect sunlight to Earth on demand. The case for doing this remains somewhat uncertain, but Reflect Orbital has said the goal is to prolong the hours of sunlight for various uses, including solar panel charging, emergency response, and military activities. The launch, which was approved by the Federal Communications Commission in July, has been met with disbelief by astronomers and environmental groups. \u201cThis is incompatible with astronomy,\u201d says Samantha Lawler, an astronomer at the University of Regina in Canada. \u201cThere is no way you can do this and preserve dark skies.\u201d Miroslav Kocifaj, an astronomer at the Slovak Academy of Sciences, and his colleagues have now calculated the broader effect on the night sky. In a new paper published online and accepted for publication in the space journal Astrophysical Journal Letters, they studied the extent to which the light the satellites beamed to the ground would scatter. They found that within the beam\u2019s target area, intended to be a circular patch five kilometers across, a single Reflect Orbital satellite would appear about 40 times brighter than the full moon in the sky. As far as 14 kilometers away from the center of the beam, the satellite would still be as bright as the full moon.\u00a0 Combining the beams of 400 satellites, which Reflect Orbital eventually plans to do, would yield a light as bright as 10,000 full moons within the five-kilometer area, or 2.4% as bright as the sun. Even up to 80 kilometers away, Kocifaj and his colleagues calculated, this combined beam would be visible as \u201ca glow above the horizon,\u201d he says. That means the night sky would be altered for many more people than those within the area Reflect Orbital intends to illuminate. \u201cDeploying these mirrors would be seriously damaging for astronomy and for the nighttime environment,\u201d says Kocifaj.\u201c The damage extends far beyond the target area.\u201d Olivier Hainaut, an astronomer at the European Southern Observatory in Germany, says the results of the paper are not surprising but are still useful. \u201cThese guys are really good at that kind of modeling,\u201d he says. \u201cThey know what they\u2019re doing.\u201d Hainaut had previously modeled the broader effect of Reflect Orbital\u2019s beams, finding they would brighten the sky up to 300% worldwide. This latest work gives an even more complete picture of what the impact would be. \u201cThese two papers really cover most of it,\u201d he says. Reflect Orbital CEO Ben Nowack disagrees with the findings of Kocifaj\u2019s paper. \u201cSome assumptions are simply inaccurate,\u201d he says. \u201cThe critical point is that our safeguards, including maintaining exclusion zones, take account of scattering.\u201d He says that the company has \u201cengaged substantively with legitimate concerns raised by astronomers, environmental researchers, and scientists,\u201d and that their feedback has \u201cinformed our technology and operational plans.\u201d Kocifaj says that Reflect Orbital has not provided data to back up its claims. The company \u201cstates that safeguards exist, that scattering is taken into account, and that the models are being updated, but it gives no numbers, no description of the model, no assumptions, and no data,\u201d he says. \u201cThere is therefore nothing that can be engaged with technically. Our calculations produce concrete figures.\u201d Reflect Orbital\u2019s intention is to place its satellites into highly inclined orbits above Earth, almost from pole to pole. This will enable them to reflect sunlight in the hours before sunrise and after sunset, extending daylight hours in certain locations. Eventually, the company has said, it wants to place satellites high enough to provide light 24-7 to locations on Earth. In August, a group of organisations including DarkSky International and the American Bird Conservancy urged the FCC to review its approval of the E\u00e4rendil-1 satellite. As well as the impact on astronomy raised by this and future satellites, the group also highlighted potential negative consequences for aviation and wildlife. \u201cOur primary request is straightforward: Reverse the Space Bureau\u2019s order, and require a lawful public-interest and NEPA [National Environmental Policy Act] review,\u201d the group said in a statement. The satellites could also pose risks to humans, according to Reflect Orbital itself. In a filing with the FCC in March, the company said that observing E\u00e4rendil-1 with a telescope larger than 12 inches \u2014which many astronomers have access to\u2014may be unsafe for human eyes. It added, though, that such observations are \u201cunlikely to \u2026 result in significant injury\u201d because the satellites are not constantly bright. Currently there is no global entity that could regulate satellites such as these, so approval falls to national regulators such as the FCC in the US. Michelle Hanlon, a space lawyer at the University of Mississippi\u2019s School of Law, says there are \u201creal benefits\u201d to the plans proposed by Reflect Orbital. \u201cIt could extend the productive hours of solar facilities and provide light in remote areas or after a disaster,\u201d she says. However, the \u201clegal basis is less clear than the technology,\u201d she says. The FCC \u201cdoes not have authority to license or regulate the operation of the solar reflector itself.\u201d It can only authorize the use of radio frequencies to communicate with the spacecraft. That means Reflect Orbital will need permission on a national and local level to reflect sunlight onto the ground, but if the beams spread as much as Kocifaj and his team predict, \u201cthe company could need approvals in more than one jurisdiction,\u201d says Hanlon. \u201cThere may also be aviation-safety and cross-border questions.\u201d The fierce debate over the satellites shows no signs of abating. \u201cIt makes me sad that astronomers are having to spend their time doing these sorts<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"pmpro_default_level":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_pvb_checkbox_block_on_post":false,"footnotes":""},"categories":[52,5,7,1],"tags":[],"class_list":["post-112958","post","type-post","status-publish","format-standard","hentry","category-ai-club","category-committee","category-news","category-uncategorized","pmpro-has-access"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3 - 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Later this year, the US company Reflect Orbital plans to launch a test satellite called E\u00e4rendil-1 that will extend an 18-by-18-meter mirror in orbit. 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