Da organização das tarefas ao acompanhamento dos treinos, passando por resumos de livros e uma proposta para ajudar a gerir a exposição solar, a equipa do TEK Notícias reuniu um novo conjunto de apps para Android e iOS, todas com opções gratuitas.
El próximo 12 de agosto, el eclipse total de Sol ofrecerá una vivencia poco habitual: parte del público podrá seguir su desarrollo sin necesidad de mirar al cielo.
El 12 de agosto de 2026 verás desde España perlas de Baily, la corona solar y misteriosas sombras volantes. Esta es la guía de lo que ocurrirá segundo a segundo durante la totalidad.
Hace 175 años, una imagen borrosa obtenida sobre metal logró algo que ningún dibujo podía garantizar: que se conservase para siempre un eclipse total de Sol y transformar unos segundos de oscuridad en material de estudio.
Olhos no céu no final da tarde de 12 de agosto. Enquanto a Lua tapa quase por completo o Sol, dezenas de localidades portuguesas preparam observações, experiências e atividades para acompanhar um dos fenómenos astronómicos mais marcantes dos últimos anos.
Et si la vie foisonnait là où on ne l’attendait pas ? Des chercheurs viennent de découvrir un monde insoupçonné. Champignons, tardigrades, vers… une véritable jungle souterraine qui bouleverse notre vision de la biosphère.
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Frequent cannabis use was associated with higher cortisol upon waking, suggesting a possible disruption of daily stress rhythms. The body’s stress system follows a daily rhythm, and frequent cannabis users may begin that cycle differently. Research from Oregon State University found that people who use cannabis often wake with higher cortisol levels than nonusers, pointing [...]
Durante unos minutos, el día se convierte en noche: los animales cambian de comportamiento y el termómetro cae varios grados. Esto es lo que le ocurre a la Tierra durante la totalidad.
Quand un aspirateur robot perd 70 % de son prix, difficile de ne pas lever les yeux de son balai. Le Lefant M210 passe à 89,95 € chez Amazon, un tarif qui change la donne pour automatiser le ménage au quotidien.
This map, based on data from the OCI (Ocean Color Instrument) on NASA’s PACE (Plankton, Aerosol, Cloud, ocean Ecosystem) satellite, shows Sargassum highly concentrated in the tropical Atlantic in June 2026.
NASA Earth Observatory/Lauren Dauphin
Sargassum, a type of brown floating algae, has shifted its range in recent decades, thinning out in the North Atlantic’s Sargasso Sea while proliferating in the tropical Atlantic. That trend, underway since 2011, continued in 2026 as the algae, commonly known as a type of seaweed, reached its annual peak in June across a stretch of ocean known as the Great Atlantic Sargassum Belt.
The belt’s Sargassum abundance in June 2026 made it the second-highest Sargassum year in the satellite record, slightly behind 2025, according to scientists at the University of South Florida (USF) College of Marine Science. Regionally, the Caribbean Sea and the Gulf of America (Gulf of Mexico) both hit record highs, according to USF’s June 2026Sargassum outlook. The western and eastern Caribbean saw 3.6 and 9 million metric tons, respectively, while the Gulf saw 5 million metric tons—nearly double its previous record, also set in 2025.
“The belt is a basin-scale phenomenon that can have devastating local-scale impacts throughout the Caribbean and Gulf, and satellite observations are the only method that captures both scales on a daily basis,” said Brian Barnes, a marine scientist at the Optical Oceanography Laboratory at USF. “The tracking done by our lab helps communities know the current extent of Sargassum and prepare for what’s to come.”
In moderate amounts in the open ocean, Sargassum provides habitat for turtles, invertebrates, fish, and birds, and adds oxygen to the water through photosynthesis. But too much of it near shore can tangle and suffocate marine life, and mats that sink can smother corals and seagrasses. On beaches, decomposing Sargassum releases hydrogen sulfide, a rotten-egg-smelling gas that’s a potential problem for both ecosystems and tourism.
The map above shows Sargassum density in the tropical Atlantic Ocean in June 2026. Red and orange areas are where Sargassum densities were the highest. Note that although the “belt” appears continuous, discrete Sargassum mats are scattered across the ocean surface. The map is based on satellite measurements of how much of the ocean surface was covered by the seaweed, averaged per pixel across all observations made in June by the OCI (Ocean Color Instrument) on NASA’s PACE (Plankton, Aerosol, Cloud, ocean Ecosystem) satellite.
This detailed view of the same PACEOCI map highlights Sargassum concentrations across the Caribbean Sea and Gulf of America, both of which saw record-high amounts of the floating algae in June 2026.
NASA Earth Observatory/Lauren Dauphin
Ocean currents and winds shape the Sargassum belt, which, despite the patchiness, stretches nearly continuously from West Africa to the Gulf and holds a fairly steady “width” from the western tropical Atlantic westward, explained Chuanmin Hu, also an optical oceanographer at USF. The ocean currents have also spared Florida’s west coast from inundation this summer, while delivering large amounts of seaweed to the Florida Keys and the state’s east coast. The bulk of the Sargassum, however, is visible in the Caribbean Sea, shown in detail above, where problems associated with inundation have been more severe, Hu said.
Data for the maps were provided by Lin Qi, an oceanographer at NOAA’s Center for Satellite Applications and Research, who has been working to generate Sargassum maps based on data from PACE, which was launched in February 2024. The work extends that of Qi and colleagues at USF’s Optical Oceanography Laboratory. This team first developed Sargassum detection techniques using MODIS (Moderate Resolution Imaging Spectroradiometer) on NASA’s long-running Terra and Aqua satellites and VIIRS (Visible Infrared Imaging Radiometer Suite) on the NOAA-20 satellite—data that have been a key component of USF’s Sargassum Watch System and of research into the seaweed’s longer-term trends.
Satellites detect Sargassum by its signals in reflected sunlight. Because of its plant structure and chlorophyll pigments, Sargassum reflects more near-infrared light than water. Scientists flag pixels where the reflectance spikes above the levels produced by plain seawater, and then they use the strength of this spike to estimate Sargassum density, which refers to the fraction of ocean surface covered by the seaweed in each pixel. Density estimates can then be converted into biomass, or the total weight of Sargassum present within a pixel, which is how the longer-term trends in the chart below are tracked.
NASA Earth Observatory/Lauren Dauphin
The chart above uses the continuous MODIS record since March 2000 to show how Sargassum biomass across the Great Atlantic Sargassum Belt has changed through June 2026. Notice the uptick beginning around 2011, when the belt was first developing, and the seasonal dips in winter and peaks in spring and summer. The record high in July 2025 stands out, followed by the quick rise in early 2026—especially in the first four months of the year—that culminated in the year’s peak in June. More recent observations, not yet reflected in the chart, indicate Sargassum biomass declined through the following month of July.
“Since the initial appearance of the Great Atlantic Sargassum Belt in 2011, the total Sargassum amount in the Atlantic Ocean has increased substantially, more than doubling every five years,” Hu said. He added that the exact mechanism is still being investigated, but it’s possibly related to ocean warming, multiple nutrient sources, and the fact that large Sargassum mats attract other organisms—such as nitrogen-fixing bacteria—that can supply additional nutrients to sustain further growth.
Alongside data from MODIS and VIIRS, OCI data from PACE now feeds into the Sargassum Watch System’s near-real-time daily and weekly composite maps. A recent study of the central-west Atlantic led by Qi, spanning May through August 2024, found that OCI offers several advantages over its predecessors, observing more of the ocean and detecting Sargassum with greater sensitivity.
Hu noted that the added pixels from OCI can improve near-real-time monitoring and analyses of short-term fluctuations. And its higher sensitivity, he said, will also lead to improved maps during winter months, “thus helping understand Sargassum changes over time.”
Additionally, the study’s authors found that OCI’s hyperspectral capability makes it the only sensor able to spectrally discriminate Sargassum pixels across the Atlantic Ocean “without ambiguity,” adding confidence to the interpretation of detected image features—especially in parts of the Atlantic where another type of floating algae, Trichodesmium, has been reported.
“I think I can speak for all project members, past and present, in sharing how rewarding it is to see the promise of PACE’s advancements come to life,” said Jeremy Werdell, PACE project scientist at NASA’s Goddard Space Flight Center. “OCI has started a true renaissance in aquatic ecosystem monitoring from space.”
NASA Earth Observatory maps and chart by Lauren Dauphin, using PACE and MODIS data courtesy of Lin Qi (NOAA), and Brian Barnes and Chuanmin Hu (University of South Florida, Optical Oceanography Laboratory). Story by Kathryn Hansen.
Fechando a semana com a nossa tradicional seleção de promoções na App Store para esta sexta-feira!
Canon: Chord Composer, desenvolvido por Dylan Shade, destaca-se como uma ferramenta de composição extremamente intuitiva e inspiradora — e, por isso, é o nosso destaque do dia.
O app combina três modos de criação (Instant Inspiration, Intelligent Discovery e Total Control), permitindo desde progressões totalmente aleatórias até construções manuais detalhadas.
A interface, limpa e direta, facilita a experimentação dos acordes de diferentes estilos (jazz, guitarra, piano, ukulele) e a audição de tudo com reprodução realista, seja você um músico profissional ou apenas um entusiasta no assunto.
Desbloqueie sua criatividade musical! Aproveite a oferta!
Abaixo outros jogos/apps que, juntos, somam quase R$60 em descontos:
La luz ultravioleta resulta imprescindible para numerosos procesos industriales, aunque producirla exige un elevado consumo energético. Un nuevo cristal fotónico podría cambiar esa situación aprovechando directamente la radiación solar.
A Coruña, Bilbao, Zaragoza, Valencia y Palma verán el Sol desaparecer del todo durante minuto y medio. Te contamos cuándo, cómo y con qué proteger los ojos para no perdértelo.
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