Alexandre Henrique Lopes Porto
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xandaolp.bsky.social
Alexandre Henrique Lopes Porto
@xandaolp.bsky.social
62 followers 60 following 1.9K posts
Analista de Sistemas que gosta de séries. Gosta também de astronomia e tecnologia. No momento fazendo pós-doutorado no LNCC.
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Theia, o planeta que formou a Lua, era vizinho do Sol
Créditos da imagem: MPS/Mark A. Garlick
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Ilustração do impacto. É uma hipótese complicada, com mais perguntas do que respostas, mas é a mais aceita pela comunidade científica.
November 27, 2025 at 8:08 AM
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Duas hélices girando ao contrário tornam navios mais eficientes
Créditosa imagem: Sintef Ocean
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Teste real das hélices contrarrotativas, que geraram um ganho significativo de propulsão para grandes navios.
November 27, 2025 at 8:02 AM
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Portrait of NGC 1055
Image Credit & Copyright: John Hayes
apod.nasa.gov/apod/ap25112...
Big, beautiful spiral galaxy NGC 1055 is a dominant member of a small galaxy group a mere 60 million light-years away toward the aquatically intimidating constellation Cetus. Seen edge-on, the island universe spans over 100,000 light-years, a little larger than our own Milky Way galaxy. The colorful, spiky stars decorating this cosmic portrait of NGC 1055 are in the foreground, well within the Milky Way. But telltale pinkish star forming regions and young blue star clusters are scattered through winding dust lanes along the distant galaxy's thin disk. With a smattering of even more distant background galaxies, the deep image also reveals a boxy halo that extends far above and below the central bulge and disk of NGC 1055. The halo itself is laced with faint, narrow structures, and could represent the mixed and spread out debris from a satellite galaxy disrupted by the larger spiral some 10 billion years ago.
November 27, 2025 at 7:48 AM
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Globular Cluster M15 Deep Field
Image Credit & Copyright: Alvaro Ibanez Perez
apod.nasa.gov/apod/ap25112...
Alnitak, Alnilam, and Mintaka, are the bright bluish stars from east to west (upper right to lower left) along the diagonal in this cosmic vista. Otherwise known as the Belt of Orion, these three blue supergiant stars are hotter and much more massive than the Sun. They lie from 700 to 2,000 light-years away, born of Orion's well-studied interstellar clouds. In fact, clouds of gas and dust adrift in this region have some surprisingly familiar shapes, including the dark Horsehead Nebula and Flame Nebula near Alnitak at the upper right. The famous Orion Nebula itself is off the right edge of this colorful starfield. The telescopic frame spans almost 4 degrees on the sky.
November 27, 2025 at 1:38 AM
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Experimento da dupla fenda com som mostra diferenças em relação à luz
Crédito da imagem: Leiden University
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Esta é a versão acústica do experimento da dupla fenda, com o cristal semicondutor contendo as fendas duplas no centro.
November 27, 2025 at 1:19 AM
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Termodinâmica da luz leva tecnologias ópticas a um novo patamar
Créditos da imagem: Hediyeh M. Dinani et al.
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Figura ilistrando a canalização não linear da luz.
November 25, 2025 at 8:09 AM
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Micromotores voam impulsionados apenas por luz
Créditos da imagem: Pedro Mena-Giraldo et al.
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Na figura, na parte (A), processo de fabricação e conceito de voo. E, na parte (B), protótipos dos micromotores voadores. Finalmente, na parte (C), micromotores em voo.
November 25, 2025 at 8:06 AM
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Modelos climáticos não incorporam a verdadeira microfísica das nuvens
Créditos da imagem: Nithin Allwayin et al.
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Como ilustrado na figura, o tamanho das gotículas determina a quantidade de luz que as nuvens dispersam e a taxa de formação de chuva. Assim, a representação imprecisa da distribuição do tamanho das gotículas nos modelos de previsão do tempo e do clima aumenta a incerteza dos cálculos resultantes.
November 25, 2025 at 6:52 AM
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Comet Lemmon and the Milky Way
Image Credit & Copyright: Lin Zixuan (Tsinghua U.)
apod.nasa.gov/apod/ap25112...
What did Comet Lemmon look like when it was at its best? One example is pictured here, featuring three celestial spectacles all at different distances. The closest spectacle is the snowcapped Meili Mountains, part of the Himalayas in China. The middle marvel is Comet Lemmon near its picturesque best early this month, showing not only a white dust tail trailing off to the right but its blue solar wind-distorted ion tail trailing off to the left. Far in the distance on the left is the magnificent central plane of our Milky Way Galaxy, featuring dark dust, red nebula, and including billions of Sun-like stars. Comet C/2025 A6 (Lemmon) is already fading as it heads back into the outer Solar System, while the Himalayan mountains will gradually erode over the next billion years. The Milky Way Galaxy, though, will live on -- forming new mountains and comets -- for many billions of years into the future.
November 25, 2025 at 6:25 AM
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Apep: Unusual Dust Shells from Webb
Image Credit: NASA, ESA, CSA, STScI, JWST; Science: Y. Han (Caltech), R. White (Macquarie U.); Image Processing: A. Pagan (STScI)
apod.nasa.gov/apod/ap25112...
What created this unusual space sculpture? Stars. This unusual system of swirls and shells, known as Apep, was observed in unprecedented detail by NASA’s James Webb Space Telescope in infrared light in 2024. Observations indicate that the unusual shape originates from two massive Wolf-Rayet stars orbiting each other every 190 years with each close passes causing a new shell of dust and gas to be expelled. Holes in these shells are thought to be caused by a third orbiting star. This stellar dust dance will likely continue for hundreds of thousands of years, possibly ending only when one of the massive stars runs out of internal nuclear fuel and explodes in a supernova punctuated by a burst of gamma-rays.
November 24, 2025 at 5:18 AM
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The Observable Universe
Illustration Credit & Licence: Wikipedia, Pablo Carlos Budassi
apod.nasa.gov/apod/ap25112...
How far can you see? Everything you can see, and everything you could possibly see, right now, assuming your eyes could detect all types of radiations around you -- is the observable universe. In light, the farthest we can see comes from the cosmic microwave background, a time 13.8 billion years ago when the universe was opaque like thick fog. Some neutrinos and gravitational waves that surround us come from even farther out, but humanity does not yet have the technology to detect them. The featured image illustrates the observable universe on an increasingly compact scale, with the Earth and Sun at the center surrounded by our Solar System, nearby stars, nearby galaxies, distant galaxies, filaments of early matter, and the cosmic microwave background.
November 23, 2025 at 8:01 AM
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Material supera diamante na condução de calor
Crédito da imagem: SIT
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Ilustração da estrutura do diamente e do arseneto de boro. Os dados observacionais do arseneto de boro vão forçar a mudança dos modelos teóricos de condutividade térmica - ele superou o diamante.
November 23, 2025 at 7:54 AM
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Descoberta liga magnetismo e eletricidade para tecnologias mais rápidas
Créditos da imagem: Noura Zenbaa et al.
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Há vários esforços envolvendo o uso dos magnons na computação, como ilustrado na figura, criando até mesmo um campo chamado magnônica.
November 23, 2025 at 7:22 AM
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Dione and Rhea Ring Transit
Image Credit & Copyright: Christopher Go
apod.nasa.gov/apod/ap25112...
Seen to the left of Saturn's banded planetary disk, small icy moons Dione and Rhea are caught passing in front of the gas giant's extensive ring system in this sharp telescopic snapshot. The remarkable image was recorded on November 20, when Saturn's rings were nearly edge-on when viewed from planet Earth. In fact, every 13 to 16 years the view from planet Earth aligns with Saturn's ring plane to produce a series of ring plane crossings. During a ring plane crossing, the interplanetary edge-on perspective makes the thin but otherwise bright rings seem to disappear. By November 23rd Saturn's rings will have reached a minimum angle for now, at their narrowest for viewing from planet Earth, but then start to widen again. Of course, Dione and Rhea orbit Saturn near the ring plane once every 2.7 and 4.5 days respectively, while the next series of Saturn ring plane crossings as seen from Earth will begin again in 2038.
November 22, 2025 at 7:55 AM
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3I/ATLAS: A View from Planet Earth
Image Credit & Copyright: Rolando Ligustri
apod.nasa.gov/apod/ap25112...
Now outbound after its perihelion or closest approach to the Sun on October 29, Comet 3I/ATLAS is only the third known interstellar object to pass through our fair Solar System. Its greenish coma and faint tails are seen against a background of stars in the constellation Virgo in this view from planet Earth, recorded with a small telescope on November 14. But this interstellar interloper is the subject of an on-going, unprecedented Solar System-wide observing campaign involving spacecraft and space telescopes from Earth orbit to the surface of Mars and beyond. And while the comet from another star-system has recently grown brighter, you'll still need a telescope if you want to see 3I/ATLAS from planet Earth. It's now above the horizon in November morning skies and will make its closest approach to Earth, a comfortable 270 million kilometers distant, around December 19.
November 21, 2025 at 8:09 AM
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Alnitak, Alnilam, Mintaka
Image Credit & Copyright: Aygen Erkaslan
apod.nasa.gov/apod/ap25112...
Alnitak, Alnilam, and Mintaka, are the bright bluish stars from east to west (upper right to lower left) along the diagonal in this cosmic vista. Otherwise known as the Belt of Orion, these three blue supergiant stars are hotter and much more massive than the Sun. They lie from 700 to 2,000 light-years away, born of Orion's well-studied interstellar clouds. In fact, clouds of gas and dust adrift in this region have some surprisingly familiar shapes, including the dark Horsehead Nebula and Flame Nebula near Alnitak at the upper right. The famous Orion Nebula itself is off the right edge of this colorful starfield. The telescopic frame spans almost 4 degrees on the sky.
November 20, 2025 at 8:06 AM
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Laser de amendoim coloca luz a serviço da medicina e da saúde
Créditos da imagem: Zhihao Huang et al.
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Os pesquisadores mediram a energia necessária para fazer o biolaser emitir luz, e os resultados mostraram que ele funciona tão bem quanto lasers feitos com materiais tradicionais.
November 20, 2025 at 8:00 AM
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Finalmente: Criada técnica de reciclagem química do PET
Créditos da imagem: Youshu Jiang et al.
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Ilustração da despolimerização catalítica (reciclagem química) de plásticos: Conversão química perfeita de resíduos de PET em matérias-primas químicas (DMT).
November 20, 2025 at 7:59 AM
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Chamaeleon Dark Nebulas
Image Credit & Copyright: Xinran Li & Houbo Zhao
apod.nasa.gov/apod/ap25111...
Sometimes the dark dust of interstellar space has an angular elegance. Such is the case toward the far-south constellation of Chamaeleon. Normally too faint to see, dark dust is best known for blocking visible light from stars and galaxies behind it. In this 11.4-hour exposure, however, the dust is seen mostly in light of its own, with its strong red and near-infrared colors creating a brown hue. Contrastingly blue, a bright star Beta Chamaeleontis is visible on the upper right of the V, with the dust that surrounds it preferentially reflecting blue light from its primarily blue-white color. All of the pictured stars and dust occur in our own Milky Way Galaxy with one notable exception: a white spot just below Beta Chamaeleontis is the galaxy IC 3104, which lies far in the distance. Interstellar dust is mostly created in the cool atmospheres of giant stars and dispersed into space by stellar light, stellar winds, and stellar explosions such as supernovas. Sometimes the dark dust of interstellar space has an angular elegance. Such is the case toward the far-south constellation of Chamaeleon. Normally too faint to see, dark dust is best known for blocking visible light from stars and galaxies behind it. In this 11.4-hour annotated exposure, however, the dust is seen mostly in light of its own, with its strong red and near-infrared colors creating a brown hue. Contrastingly blue, a bright star Beta Chamaeleontis is visible on the upper right of the V, with the dust that surrounds it preferentially reflecting blue light from its primarily blue-white color. All of the pictured stars and dust occur in our own Milky Way Galaxy with one notable exception: a white spot just below Beta Chamaeleontis is the galaxy IC 3104, which lies far in the distance. Interstellar dust is mostly created in the cool atmospheres of giant stars and dispersed into space by stellar light, stellar winds, and stellar explosions such as supernovas.
November 19, 2025 at 7:49 AM
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Ler as horas em um relógio quântico gasta mais energia que fazê-lo funcionar
Créditos da imagem: Natalia Ares/Vivek Wadhia/Federico Fedele
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Ilustração da diferença de energia entre operar um relógio quântico (Em cima: Um único elétron saltando entre duas regiões em nanoescala) e ler os tiques do relógio (embaixo). A energia necessária para ler o relógio é aproximadamente um bilhão de vezes maior do que a energia necessária para fazê-lo funcionar.
November 19, 2025 at 7:42 AM
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Fractais e metamateriais juntam-se para melhorar som automotivo
Créditos da imagem: Zhi-Han Li et al.
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Uma vez projetada para cada veículo, a metassuperfície fractal, ilustrada na figura, é barata de fabricar, sendo necessário apenas colocá-la à frente do alto-falante do carro.
November 19, 2025 at 7:37 AM
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Núcleo da Terra é sólido ou líquido? Nenhum deles, é superiônico
Créditos da imagem: Yuqian Huang et al.
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Os átomos de ferro formam uma estrutura hexagonal compacta rígida, com um subconjunto deles apresentando movimento coletivo. Dentro dessa rede de ferro, alguns elementos (intersticiais) difundem-se livremente, como em um líquido, enquanto outros (substitucionais) permanecem confinados como em um sólido. Consequentemente, o núcleo interno da Terra existe em um estado híbrido entre sólido e líquido.
November 19, 2025 at 7:33 AM
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Sistema Solar é três vezes mais rápido, contestando teoria cosmológica
Crédito da imagem: FAST Telescope
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A técnica consiste em usar radiotelescópios, como ilustrado por uma representação artística, para medir a quantidade de radiogaláxias que "surgem no horizonte" conforme nos movemos pelo Universo.
November 19, 2025 at 7:06 AM
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Gerador transforma vibrações de qualquer frequência em energia
Créditos da imagem: Tseng/Su
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Protótipo do gerador autoajustável para coletar vibrações de várias frequências.
November 19, 2025 at 3:28 AM
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Miniaturização da Metrologia quer um INMETRO dentro de um chip
Créditos da imagem: Gianluca Milano et al.
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O conceito, ilustrado na figura, é chamado de "instituto nacional de metrologia dentro de um chip".
November 19, 2025 at 3:23 AM