Alexandre Henrique Lopes Porto
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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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Cat Found Outside Unable to Move, But After Weeks Indoors, He Becomes Happiest Cat He was Always Meant to Be
www.lovemeow.com/cat-weeks-in...
Cat Found Outside Unable to Move, But After Weeks Indoors, He Becomes Happiest Cat He was Always Meant to Be
A cat was found outside, unable to move, but after just a few weeks indoors, he transformed into the happiest cat he was always meant to be. AspenChatonsOrphelinsMontrea...
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November 27, 2025 at 8:20 AM
xandaolp.bsky.social
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
xandaolp.bsky.social
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
xandaolp.bsky.social
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
xandaolp.bsky.social
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
xandaolp.bsky.social
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
xandaolp.bsky.social
Kittens Arrive at a Shelter, Little Do They Know a Family Will Drive Hours to Keep All 3 Cats Together
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Kittens Arrive at a Shelter, Little Do They Know a Family Will Drive Hours to Keep All 3 Cats Together
Three kittens were brought to a shelter. Little did they know that one day, a family would drive many hours to keep them all together. Masha, Irina, and OlgaMollyThree f...
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November 25, 2025 at 8:16 AM
xandaolp.bsky.social
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
xandaolp.bsky.social
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
xandaolp.bsky.social
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
xandaolp.bsky.social
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
xandaolp.bsky.social
They Never Give Up on Two Kittens Left in a Yard, Now the Cats are Ready for a Happy Ending This Thanksgiving
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They Never Give Up on Two Kittens Left in a Yard, Now the Cats are Ready for a Happy Ending This Thanksgiving
They never gave up on two kittens left in a yard. Now, the young cats are ready for a happy ending this Thanksgiving. Butterball and WishboneTailsHighEarly last month, t...
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November 24, 2025 at 7:37 AM
xandaolp.bsky.social
They Bring in a Kitten Spotted in a Puddle and Watch Her Blossom Alongside Cat Friend Who Matches Her Spirit
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They Bring in a Kitten Spotted in a Puddle and Watch Her Blossom Alongside Cat Friend Who Matches Her Spirit
They brought in a kitten who had been found in a puddle and watched her blossom alongside a feline friend who matched her spirit. FallonKelseyA tiny kitten named Fallon ...
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November 24, 2025 at 7:31 AM
xandaolp.bsky.social
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
Reposted by Alexandre Henrique Lopes Porto
ridingrobots.bsky.social
One thing photos don't capture is the awesome immensity of these structures filling the sky, bridging the boundary between Earth and space.
November 24, 2025 at 3:48 AM
xandaolp.bsky.social
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
xandaolp.bsky.social
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
xandaolp.bsky.social
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
xandaolp.bsky.social
After Almost a Year They Bring Big Street Cat to Safety, Only to Discover He's Gentle Giant with a Lot to Say
www.lovemeow.com/year-street-...
After Almost a Year They Bring Big Street Cat to Safety, Only to Discover He's Gentle Giant with a Lot to Say
After nearly a year of effort, a rescuer finally brought a big street cat to safety, only to discover he was a gentle giant with plenty to say. Bundt CakeHaleyHaley, a d...
www.lovemeow.com
November 22, 2025 at 8:04 AM
xandaolp.bsky.social
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
xandaolp.bsky.social
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
xandaolp.bsky.social
They Return to Yard for a Missing Kitten After Saving Cat Family, Turns Out the Little Guy Has Heart of Gold
www.lovemeow.com/yard-missing...
They Return to Yard for a Missing Kitten After Saving Cat Family, Turns Out the Little Guy Has Heart of Gold
They returned to the backyard for a missing kitten after rescuing a cat family. As it turned out, the little guy had a heart of gold. BuckyLittleWanderersNYCLast month, ...
www.lovemeow.com
November 20, 2025 at 8:10 AM
xandaolp.bsky.social
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
xandaolp.bsky.social
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
xandaolp.bsky.social
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