Salva Bará

By Qiming Zheng et al:

Robust reconstruction of seamless daily VIIRS nighttime light imagery with cloud mask refinement and multi-strategy spatiotemporal gap-filling

doi.org/10.1016/j.rs...

Susan Sarandon joins UNRWA to remind the world that, amid devastation in #Gaza, UNRWA continues its work: keeping clinics open, sustaining shelters, and delivering emergency aid and education to thousands.

Together, we are UNRWA.

Donate now at: donate.unrwa.org/help

Cobb's cartoon "They're having problems with their economy again"

Just your regularly scheduled share of this masterpiece by @tomgauld.bsky.social

We Will Not Be Divided Employees of Google and OpenAI stand together to refuse the Department of War's demands to use AI models for domestic mass surveillance and autonomous killing without human oversight.

Profesionais do sector de IA resistindo a presión do goberno USA que quere obter deles "models to be used for domestic mass surveillance and autonomously killing people without human oversight."

notdivided.org

Two satellite proposals threaten dark and quiet skies worldwide Giant mirrors in space to create sunlight at night and an AI data center made up of 1-million satellites are undergoing regulatory approval. How did we get here?

"Access to the night sky is a crucial part of our scientific, religious, and cultural practices across the globe. Right now, one government agency has the power to completely alter the night sky as we know it."

astrobites.org/2026/02/26/r...

#Space #SpaceEnvironment #SpaceX #DataCenters

One million satellites could be unilaterally authorized by a single government ➡️ It is time for some countries to activate the international consultation process provided for in OST article IX...

From our Aotearoa (U Canterbury) 🇳🇿 team of Laura Revell, myself @astrokiwi.bsky.social and currently visiting Erskine Fellow @sundogplanets.mastodon.social.ap.brid.gy. Cross-disciplinary partnership at work 🚀

Una treintena de científicos desmonta un estudio utilizado por los cazadores para avalar la captura de aves cantoras La revista ‘Ecological Indicators’, donde apareció una controvertida investigación sobre conteo de pájaros, publica una réplica que denuncia graves deficiencias y conflicto de intereses

elpais.com/clima-y-medi...

A new space race could turn our atmosphere into a ‘crematorium for satellites’ Planned ‘megaconstellations’ of satellites could cause unforeseen harm to the ozone layer and climate systems. Global regulation is needed before it’s too late.

"Rocket launches already contribute to climate change and ozone depletion. Scaling them up to deploy a million aircraft-sized satellites would push upper-atmosphere heating and ozone loss far beyond previous estimates, with the steady burn-up of dead satellites compounding the impacts." 🧪🛰️🚀

"There is no public mandate for a single company in one country to make changes on that scale to the planet’s atmosphere." - Lawler, @astrokiwi.bsky.social & Revell (2026)

"no group has the right to change the Earth's environment in any significant way w/o full int'l study & agreement" - IAU (1961)

It is time for some countries to activate the international consultation process provided for in OST art. IX...

A new space race could turn our atmosphere into a ‘crematorium for satellites’ Planned ‘megaconstellations’ of satellites could cause unforeseen harm to the ozone layer and climate systems. Global regulation is needed before it’s too late.

Excellent piece from @astrokiwi.bsky.social @sundogplanets.mastodon.social.ap.brid.gy & Laura Revell.

This one sentence is the crux of it all 👇

"There is no public mandate for a single company in one country to make changes on that scale to the planet’s atmosphere."

Highly recommended.

🔭🧪

De mora luminis: Roemer’s discovery 350 years later De mora luminis: Roemer’s discovery 350 years later, Falchi, Fabio, Furgoni, Riccardo, Gattillo, Paolo, Francesio, Maurizio

By Fabio Falchi:

De mora luminis: Roemer's discovery 350 years later.

"Today in European Journal of Physics a new paper on the measurement of the speed of light"

iopscience.iop.org/article/10.1...

#HistSci #HistAst #AstronomyHistory #HistoryOfScience

“Human rights are not a slogan for good times. They are a duty at all times.

And so we must stand up for them – and even when it is difficult, inconvenient, or costly.

Especially then,” UN Secretary-General António Guterres tells the Human Rights Council.

Full remarks: www.un.org/sg/en/conten...

Too many satellites? Earth’s orbit is on track for a catastrophe – but we can stop it Cultural, spiritual, and most environmental impacts aren’t taken into account when launching thousands of satellites.

CSE's own Prof. Samantha Lawler (University of Regina) has a new article in @theconversation.com in which she argues that the rapid expansion of satellite megaconstellations poses a catastrophic threat to Earth's orbit and the cultural heritage of the night sky.

theconversation.com/too-many-sat...

Last December, UNRWA Commissioner-General welcomed the vote by the UN General Assembly as “an acknowledgement of the international community’s responsibility to support the humanitarian & human development needs of #Palestine Refugees pending a just & lasting solution to their decades-long plight.

Last December, UNRWA Commissioner-General welcomed the vote by the UN General Assembly as “an acknowledgement of the international community’s responsibility to support the humanitarian & human development needs of #Palestine Refugees pending a just & lasting solution to their decades-long plight.”

UNRWA has a unique logistical footprint across #Gaza.

With an unmatched network of over 11,000 staff, expertise, and trust, UNRWA continues to work.

UNRWA helped these 31 babies get the medical help they needed.

➡️ Let UNRWA continue its work
➡️ Open the crossings
➡️ Let aid in at scale

#UNRWAworks

"Rethinking Scientific Production

The Slow Science Movement advocates for a more thoughtful, sustainable approach to research that values... depth over speed."

"... we call on those with secure positions—senior and tenured scientists, lab leaders—to lead the way."

www.slow-science.com/index.html

UNRWA was established by the United Nations General Assembly with a clear humanitarian and development mandate: to provide assistance and protection to #Palestine Refugees pending a just and lasting solution to their plight.

#UNRWAworks and must continue until such a solution is found.

In #Gaza, UNRWA teams continue showing up every day. Providing health, education, sanitation services, lifesaving aid and more.

UNRWA has an unparalleled capacity to support people in Gaza and deliver an unhindered, safe and dignified humanitarian response.

UNRWA cannot be replaced.

#UNRWAworks

La revolución solar ya no espera: el nuevo estándar del alumbrado público se desgranará en el LII Simposium Nacional de Alumbrado - CEI - Comité Español de Iluminación

Quen pode querer unha noite como a da dereita da imaxe?

www.ceisp.com/la-revolucio...

La fine del buio - Come abbiamo distrutto la notte con la luce artificiale YouTube video by Università di Parma

La fine del buio - Come abbiamo distrutto la notte con la luce artificiale

Seminario EU GREEN sull’inquinamento luminoso con il fisico e astronomo Fabio Falchi

www.youtube.com/live/z0mblPD...

Moving space debris out of the way with OMLET

"@esa.int is already making use of laser technology to detect and monitor #SpaceDebris. But what if we could also use laser technology to actually prevent collisions?"

www.esa.int/ESA_Multimed...

(We note how the answer always seems to be "more tech", not "less pollution".)

#SpaceEnvironment

Starlink Is Dropping From the Sky Again and Again. Scientists Warn Earth Is Already Feeling the Effects For decades, space safety rules assumed satellite reentries would stay rare. By early 2026, with over 70,000 megaconstellation spacecraft planned, that assumption has collapsed.

"For decades, space safety rules assumed satellite reentries would stay rare. By early 2026, with over 70,000 megaconstellation spacecraft planned, that assumption has collapsed."

indiandefencereview.com/starlink-sat...

#Space #Satellites #SpaceEnvironment

Lifecycle assessment of carbon emissions from low earth orbit satellite and terrestrial internet networks The rapid expansion of low Earth orbit (LEO) satellite networks to improve global internet access has raised concerns about their environmental impact compared to terrestrial infrastructure. This s...

"This study reveals that LEO satellite internet systems are more carbon-intensive (0.1–0.5 kg CO₂e/GB) than terrestrial fibre (0.05–0.20 kg CO₂e/GB) due primarily to emissions from launch processes and operations."

doi.org/10.1080/1758...

#Space #SpaceEnvironment

158 first-gen Starlinks have now relocated from the 547 km/53 deg shell to the 475 km/53 deg shell. About another 180 are on the way down still.

Satellite megaconstellations continue to grow. Could their debris fall on us? "What happens if the minimum lethal amount of debris from each satellite does not burn up and reaches the ground intact?"

"A new study looks into eleven different megaconstellations and what would happen during their fiery reentry into Earth's atmosphere. They find that there's a 40% collective risk of on-ground casualties if satellites do not burn up entirely."

www.space.com/space-explor...

#Space #SpaceEnvironment

‘The normal should be darkness’: why one Belgian national park is turning off ‘pointless’ streetlights The radical project is an attempt to preserve wildlife in one of Europe’s most light-polluted countries, but can they persuade local people they will still feel safe?

‘The normal should be darkness’: why one Belgian national park is turning off ‘pointless’ streetlights