Tag

Light Pollution

All articles tagged with #light pollution

health28 days ago•9 min saved

Darkness as a Cardiovascular Vital Sign: Nighttime Light May Alter the Heart

A UK Biobank study of 11,071 people found that higher nighttime light exposure (>3 lux) measured by wrist sensors and followed by cardiac MRI three years later is associated with thicker left-ventricular walls, reduced chamber volume, and early signs of impaired heart function, with changes also seen in other heart chambers. The researchers warn that light pollution might contribute to cardiovascular risk and advocate reducing nighttime light exposure (e.g., blackout curtains, warm lighting) as a potential preventive measure, alongside clinicians asking about patients’ sleep environments.

via News-Medical|

#cardiac-remodeling #health #left-ventricle

health1 month ago•211 min saved

Nighttime light exposure linked to heart remodeling, study finds

A UK Biobank study of over 11,000 adults found that sleeping in more than 3 lux of light at night thickens the walls of the left ventricle and reduces the heart’s pumping efficiency, with greater damage as bedroom brightness increases. The effect is partly tied to shorter sleep duration (under five to six hours). The study, published in the European Heart Journal, used wrist light sensors and follow-up MRI three years later. Experts caution that wrist sensors aren’t a perfect proxy for eye exposure and that the findings show association, not causation. Practical tips include blocking ambient light with blackout curtains or a sleep mask, and clinicians/policymakers may consider nighttime light reduction as a potential heart disease prevention strategy.

via CNN|

#cardiovascular-disease #circadian-rhythm #health

technology1 month ago•4 min saved

From Orange to White: Satellites Record the Global LED Makeover of City Nightscapes

Astronaut Don Pettit’s ISS photos document a global shift from warm orange sodium-vapor streetlights to brighter white LEDs over the past 15 years, driven by cost and controllability. The transition changes how cities look and feel at night, with many places warming LED colors to ~3,000K after initial ~4,000K deployments; Hong Kong remains sodium-lit while nearby Shenzhen has switched to LEDs, illustrating the uneven adoption of the change.

via PetaPixel|

#city-at-night-from-space #don-pettit #led-lighting

science1 month ago•16 min saved

Skyglow Swallows the Milky Way for Over a Third of Humanity

Artificial skyglow now hides the Milky Way from more than a third of humanity, not because the galaxy has dimmed but because urban lighting brightens the night sky. A 2016 atlas using satellite radiance and 35,000 ground observations estimated that about 83% of people live under light-polluted skies, with the Milky Way’s visibility falling below a defined threshold under typical clear-sky conditions. Visibility varies by location, weather, and dark-adaptation. Skyglow results from scattered artificial light in the atmosphere, distinct from glare or light trespass. Studies show sky brightness has been rising in many places (7–10% per year in some datasets), and while LEDs offer efficiency, rebound effects and blue-rich light can worsen the problem. Solutions call for targeted, downward-facing, low-level, warm-colored lighting with controls, recognizing that the Milky Way remains—it’s the brightened air between us and it that has changed.

via Space Daily|

#astronomy #led-lighting #light-pollution

space-and-astronomy1 month ago•60 min saved

Giant space mirrors could turn night into daylight, astronomers warn

A Space.com study on Reflect Orbital’s plan to deploy space mirrors finds that a single 60-by-60-foot mirror would cast a beam roughly 3.4 miles wide that appears 40 times brighter than the full Moon to observers in its path, turning the night sky into a twilight zone and washing out stars within the beam. The glow would extend up to about 50 miles from the beam, and could brighten the sky above the horizon for many miles in the beam’s direction, depending on conditions. If 40,000 mirrors were launched, the combined light could be 10,000 times brighter than the full Moon, creating daytime-like brightness that could hinder astronomy, even as proponents tout potential uses for nighttime solar power and disaster illumination. The FCC licensed a demonstration satellite (EARENDIL-1) for this concept, prompting objections from astronomers and environmental groups; Reflect Orbital argues that only a fraction would be active and that coordination with NSF and independent researchers is planned. The debate highlights a tension between space-led lighting/testing and preserving dark skies for astronomy.

via Yahoo|

#astronomy #light-pollution #reflect-orbital

space1 month ago•163 min saved

Space mirrors could render night skies daylight, study warns

A study on Reflect Orbital’s proposed sun-reflecting space mirrors finds that observers in the beam would see a light intensity up to 40 times brighter than the full Moon, with the resulting sky glow potentially wiping out stars. If 40,000 mirrors were deployed, the combined brightness could reach 10,000 times the Moon’s, extending visibility and twilight-like brightness up to tens of kilometers away and threatening astronomical observations. The company has FCC permission to test an 18-by-18-meter mirror on the EARENDIL-1 satellite, a move that has drawn objections from astronomers and environmental groups who cite insufficient environmental review and data transparency; Reflect Orbital argues many mirrors would be inactive or placed in remote locations.

via Space|

#astronomy #fcc #light-pollution

science1 month ago•12 min saved

Europe’s fading night sky becomes a public-health issue

A long-form piece argues that almost all of Europe now lives under light-polluted skies that erase real darkness, a change scientists are increasingly treating as a public-health issue because nighttime artificial light is linked to sleep disturbances and mental-health patterns. Citing a 2016 atlas showing 99% of people in the U.S. and Europe under skies too bright to see real darkness, plus research from the National Institute of Mental Health and others, the article contends that excessive lighting shifts physiology and mood. It blends personal experience—standing under a pristine sky in Bronchales—with scientific context to emphasize that darkness is a measurable environmental factor, not just an astronomy concern, and calls for urban lighting that preserves stars while maintaining safety and function.

via Space Daily|

#light-pollution #mental-health #night-sky

photography1 month ago•6 min saved

Global Night Skies Shine as Capture the Dark 2026 Names 31 Winners

DarkSky International announced the Capture the Dark 2026 winners, a record-setting nighttime photography contest with 31 winning images across nine categories from photographers in more than 30 countries, highlighting the beauty of dark skies while underscoring the increasing impact of light pollution.

via PetaPixel|

#astrophotography #capture-the-dark-2026 #dark-skies

science2 months ago•12 min saved

Orbiting Sunlight on Demand: Space Mirrors Threaten Skies and Science

Reflect Orbital plans an initial test of an 18-square-meter space mirror and aims for up to 50,000 such satellites to beam sunlight to Earth for energy, agriculture, or emergency lighting. While offering potential benefits, astronomers warn that the resulting skyglow could disrupt ground-based astronomy, pose eye-safety risks to amateur observers, and expose gaps in regulation, raising concerns that tens of thousands of bright mirrors could severely impair the night sky unless safeguards are proven and enforced.

via The Verge|

#astronomy #light-pollution #regulation

science2 months ago•11 min saved

Ground observers reveal skyglow is accelerating beyond satellite estimates, dimming the night sky for a generation

A 2023 Science study analyzing 51,351 naked-eye reports from Globe at Night finds artificial night-brightening is increasing about 9.6% per year, faster than satellite records showed, which could reduce the number of visible stars for a growing portion of the world’s population (roughly 6.5%/yr in Europe and 10.4%/yr in North America). The mismatch arises because satellites measure radiance differently from how the human eye perceives star visibility, especially with blue-rich LEDs and light scattered by the atmosphere. The overall message is that light pollution is advancing quickly and solutions like shielding and smarter lighting could help retain the night sky for future generations.

via Space Daily|

#citizen-science #globe-at-night #light-pollution

science2 months ago•135 min saved

Private Space Mirrors Could Redraw the Night Sky, Law Can't Catch Up

The FCC approved Reflect Orbital’s test deployment of a space mirror to reflect sunlight onto Earth after dusk, a plan that could lead to thousands of such mirrors and radically alter how the night sky looks. Scientists warn this could dramatically increase light pollution, harming astronomy, wildlife, and ecosystems, and could push the sky toward a “Saturn’s ring” of reflections if other megaconstellations go forward (SpaceX, Blue Origin, Starlink, etc.). International law, notably the 1967 Outer Space Treaty, gives nations liability and registration authority, but enforcement and cross-border oversight are weak, slow, and unlikely to stop unilateral corporate projects. UN bodies COPUOS and UNOOSA may discuss controls, but consensus is hard and progress is slow, leaving significant regulatory gaps that critics say may require new legislation or a shift in administration to address environmental and cultural impacts. Meanwhile, proponents argue private space infrastructure could advance tech and commerce, heightening the urgency for a global framework to manage light pollution and space traffic.

via Space|

#fcc #light-pollution #outer-space-treaty

technology2 months ago•10 min saved

Orbital mirrors set to beam daylight to Earth, but questions abound

The FCC approved Reflect Orbital to launch a pilot low-Earth-orbit satellite with movable mirrors to reflect sunlight to Earth, potentially lighting a 5 km patch for up to an hour; however, delivering meaningful daylight would require thousands of satellites with massive mirrors, making the concept expensive and likely less economical than battery storage, while experts warn about sleep disruption, wildlife and ecological impacts, and interference with astronomy as regulators debate planetary governance.

via ABC News & Headlines – Australian Broadcasting Corporation|

#fcc-regulation #feasibility-cost #light-pollution

science2 months ago•48 min saved

Sun-Reflecting Satellite Sparks Astronomy Debate as FCC Greenlights Demonstration

The FCC approved Reflect Orbital’s Earendil-1 mission, a single-satellite demonstration that would reflect sunlight to Earth at night with a steerable mirror; while hailed as a potential breakthrough in solar energy delivery and disaster lighting, scientists warn it could brighten wide swaths of the sky, disrupt dark-sky research, and set a precedent for tens of thousands of satellites without robust regulation.

via Yahoo|

#astronomy #fcc-regulation #light-pollution

technology2 months ago•3 min saved

US Approves 60-Foot Orbital Mirror to Light Night Sky, Sparks Astronomical Backlash

The US FCC has approved Reflect Orbital’s plan to launch Eärendil-1, a 60-foot square mirror satellite that will unfurl in orbit about 400 miles up to reflect sunlight onto a targeted three-mile-wide patch on Earth. Users could pay about $5,000 per hour for access, with a requirement of 1,000 annual hours, though the company also envisions a fleet of up to 1,000 much larger mirrors. While the tech could aid nighttime illumination for photographers or emergencies (and benefit solar farms at night), scientists warn it could drastically alter the night sky and disrupt circadian rhythms, animal migrations, plant cycles, and oceanic ecosystems.

via PetaPixel|

#astronomy #circadian-rhythms #light-pollution

technology2 months ago•2 min saved

FCC Approves Orbital Sun-Reflectors, Igniting Astronomy Alarm Over Night Sky

The US FCC has approved Reflect Orbital’s plan to launch a constellation of sun-reflecting satellites, beginning with the 60‑foot Eärendil-1 prototype, to illuminate dark areas and support solar power after sunset. The project envisions up to 50,000 mirrors by 2035, but astronomers warn the mirrors could disrupt observations and light pollution, while biologists voice concerns about ecological and circadian impacts. Critics question whether such a fleet is feasible or safe, even as the company touts a possible fossil-fuel替ing energy source, and public comments on the proposal were highly critical.

via Futurism|

#astronomy #light-pollution #satellites