Alexandre Henrique Lopes Porto
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Alexandre Henrique Lopes Porto
@xandaolp.bsky.social
64 followers 60 following 2K 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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3I/ATLAS Flyby
Image Credit & Copyright: Dan Bartlett
apod.nasa.gov/apod/ap25122...
Attention grabbing interstellar visitor 3I/ATLAS made its not-so-close flyby of our fair planet on December 19 at a distance of 1.8 astronomical units. That's about 900 light-seconds. Still, this deep exposure captures the comet from another star system as it gently swept across a faint background of stars in the constellation Leo about 4 days earlier, on the night of December 15. Though faint, colors emphasized in the image data, show off the comet's yellowish dust tail and bluish ion tail along with a greenish tinged coma. And even while scrutinized by arrays of telescopes and spacecraft from planet Earth, 3I ATLAS is headed out of the Solar System. It's presently moving outward along a hyperbolic trajectory at about 64 kilometers per second relative to the Sun, too fast to be bound the Sun's gravity.
December 26, 2025 at 7:51 AM
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Cat Wanders into a Yard and Starts Living There Until His Life Takes the Happiest Turn This Holiday Season
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Cat Wanders into a Yard and Starts Living There Until His Life Takes the Happiest Turn This Holiday Season
A cat wandered into a yard and began living there until his life took the happiest turn this holiday season. DumbledoreTheStrayCatClubFor years, a cat drifted in and out...
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December 25, 2025 at 7:21 AM
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Unicorn, Fox Fur and Christmas Tree
Image Credit & Copyright: Michael Kalika
apod.nasa.gov/apod/ap25122...
This beautiful but complex arrangement of interstellar gas and dust is about 2,700 light-years distant in the faint but fanciful constellation Monoceros, the Unicorn. Seen toward the celestial equator and near the plane of our Milky Way galaxy, the seasonal skyscape mixes reddish emission nebulae excited by energetic light from newborn stars with dark interstellar dust clouds. Where the otherwise obscuring dust clouds lie close to the hot, young stars, they also reflect starlight, forming blue reflection nebulae. In fact, bright variable star S Monocerotis is immersed in a blue-tinted haze near center. Arrayed with a simple triangular outline above S Monocerotis, the stars of NGC 2264 are popularly known as the Christmas Tree star cluster. Carved by energetic starlight, the Cone Nebula sits upside down at the apex of this cosmic Christmas tree while the dusty, convoluted pelt of glowing gas and dust under the tree is called the Fox Fur Nebula.
December 25, 2025 at 7:13 AM
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Man Notices a Kitten Near the Woods and Brings Him to Safety, But Can't Stop Thinking About the Young Cat
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Man Notices a Kitten Near the Woods and Brings Him to Safety, But Can't Stop Thinking About the Young Cat
A man noticed a kitten near the woods and brought him to safety, but he couldn't stop thinking about the young cat. MackSparkleCatRescueA kind-hearted man spotted a smal...
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December 24, 2025 at 8:04 AM
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Mystery: Little Red Dots in the Early Universe
Image Credit: NASA, ESA, CSA, STScI, JWST; Dale Kocevski (Colby College)
apod.nasa.gov/apod/ap25122...
What are these little red dots (LRDs)? Nobody knows. Discovered only last year, hundreds of LRDs have now been found by the James Webb Space Telescope in the early universe. Although extremely faint, LRDs are now frequently identified in deep observations made for other purposes. A wide-ranging debate is raging about what LRDs may be and what importance they may have. Possible origin hypotheses include accreting supermassive black holes inside clouds of gas and dust, bursts of star formation in young dust-reddened galaxies, and dark matter powered gas clouds. The highlighted images show six nearly featureless LRDs listed under the JWST program that found them, and z, a distance indicator called cosmological redshift. Additionally, searches are underway in our nearby universe to try to find whatever previous LRDs might have become today.
December 24, 2025 at 7:51 AM
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Street Cat Approaches People, Hoping for a Warm Place This Winter and the Good Life He's Always Wanted
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Street Cat Approaches People, Hoping for a Warm Place This Winter and the Good Life He's Always Wanted
A street cat approached people, hoping to find a warm place this winter and finally experience the good life he'd always wanted. JingleLittleWanderersNYCEarlier this mon...
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December 23, 2025 at 7:53 AM
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Red Sprites and Circular Elves Lightning over Italy
Image Credit & Copyright: Valter Binotto
apod.nasa.gov/apod/ap25122...
What's happening in the sky? Lightning. The most commonly seen type of lightning involves flashes of bright white light between clouds. Over the past 50 years, though, other types of upper-atmospheric lightning have been confirmed, including tentacled red sprites and ringed ELVES. Although both last only a small fraction of a second, sprites are brighter and easier to photograph than their more common electrical-discharge cousins. ELVES are rapidly expanding rings that are thought to be created when an electromagnetic pulse shoots upward from charged clouds and impacts the ionosphere, causing nitrogen molecules to glow. Capturing either form of lightning takes patience and experience -- capturing them both together, since they usually occur separately, is rare. The featured image is a frame from a video recorded from Possagno, Italy late last month above a distant thunderstorm over the Adriatic Sea.
December 23, 2025 at 7:46 AM
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Garra robótica inspirada em planta cria robô inspirado em pássaro
Créditos da imagem: Jie Zhang et al.
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Como mostrado na ilustração da figura, a inspiração para a garra robótica veio da cápsula de sementes de uma planta ornamental.
December 23, 2025 at 7:44 AM
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Ciência básica coloca eletrônica impressa de baixo custo no horizonte
Créditos da imagem: Tian Carey et al.
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Protótipos construídos com alguns dos materiais selecionados.
December 23, 2025 at 7:22 AM
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Fio quântico faz massa e energia fluírem sem resistência e sem perda
Crédito da imagem: TU Wien
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O fio quântico formado pelos átomos aprisionados e levitados, ilustrado na figura, revelou um novo tipo de transporte de massa.
December 23, 2025 at 7:19 AM
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Neurochip conversa com o cérebro por meio de luz - de fora do crânio
Créditos da imagem: Mingzheng Wu/Northwestern University
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O dispositivo fino, flexível e sem fio, mostrado na figura, emite padrões complexos de luz (mostrados aqui como um "N") para transmitir informações diretamente ao cérebro.
December 23, 2025 at 3:16 AM
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Sunset Solstice over Stonehenge
Image Credit & Copyright: English Heritage, Josh Dury
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Yesterday the Sun reached its southernmost point in planet Earth's sky. Called a solstice, many cultures mark yesterday's date as a change of seasons -- from autumn to winter in Earth's Northern Hemisphere and from spring to summer in Earth's Southern Hemisphere. The featured image was taken just before the longest night of the 2025 northern year at Stonehenge in United Kingdom. There, through stones precisely placed 4,500 years ago, a 4.5 billion year old large glowing orb is seen setting. Even given the precession of the Earth's rotational axis over the millennia, the Sun continues to set over Stonehenge in an astronomically significant way.
December 22, 2025 at 8:01 AM
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Kittens Arrive at a Foster Home and Meet Residents Who are Ready to Show Them 'How to Cat'
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Kittens Arrive at a Foster Home and Meet Residents Who are Ready to Show Them 'How to Cat'
Three kittens arrived at their foster home and met feline residents who were ready to show them "how to cat." Jennifer @newkittensontheblockThree kittens, Cricket, Firef...
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December 22, 2025 at 2:44 AM
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Todas as partículas do Universo são inextricavelmente entrelaçadas
Créditos da imagem: Pawel Blasiak et al.
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Experimento óptico linear passivo, como o ilustrado na figura, pode ser usado para demonstrar a proposta dos físicos.
December 22, 2025 at 2:39 AM
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Solstice on a Spinning Earth
Image Credit: Meteosat 9, NASA, Earth Observatory, Robert Simmon
apod.nasa.gov/apod/ap25122...
December 21, 2025 at 8:13 AM
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Maior fonte de poluição nas estradas não sai pelo escapamento
Créditos da imagem: ITnA - TU Graz
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Como mostrado na figura, as medições realizadas nos bancos de ensaio de rolos, avaliando também o desgaste dos pneus e do asfalto e as partículas levantadas pelo contato entre os dois.
December 21, 2025 at 7:27 AM
Reposted by Alexandre Henrique Lopes Porto
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James #Webb Space Telescope #JWST

High-resolution mapping of the very cold superwind in ESO484-036

TARGNAME= #ESO-484-36
2024-12-20
PI_NAME = Mazzilli Ciraulo, Barbara
MIRI 2100 1130 770

yuval-harpaz.github.io/astro/jwst_l...

NASA/ESA/CSA/STScI/j. Roger
December 20, 2025 at 5:46 PM
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Cat Shows Up Outside a House and Waits Until He's Safe Indoors, He Shows His Joy in the Sweetest Way
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Cat Shows Up Outside a House and Waits Until He's Safe Indoors, He Shows His Joy in the Sweetest Way
A cat showed up outside a house and waited until he was safe indoors. He showed his happiness in the sweetest way. BaliChatonsOrphelinsMontrealRozy, who cares for local ...
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December 20, 2025 at 8:20 AM
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A Solstice Sun Tattoo
Image Credit & Copyright: Marcella Pace
apod.nasa.gov/apod/ap25122...
The word solstice is from the Latin for Sun and to pause or stand still. And in the days surrounding a solstice the Sun's annual north-south drift in planet Earth's sky does slow down, pause, and then reverse direction. So near the solstice the daily path of the Sun through the sky really doesn't change much. In fact, near the December solstice, the Sun's consistent, low arc through northern hemisphere skies, along with low surface temperatures, has left a noticeable imprint on this path to the mountain town of Peaio in northern Italy. The morning frost on the road has melted away only where the sunlight was able to reach the ground. But it remains in the areas persistently shadowed by the fence, tattooing in frost an image of the fence on the asphalt surface.
December 20, 2025 at 8:10 AM
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Cat Found Hiding Her Kittens in a Closet Finally Living the Good Life She Longed for
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Cat Found Hiding Her Kittens in a Closet Finally Living the Good Life She Longed for
A cat who was found hiding her kittens in a closet is finally living the good life she's always longed for. McGonagallTheStrayCatClubAbout two months ago, a cat wandered...
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December 20, 2025 at 8:04 AM
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Madeira super-hidrofóbica repele a água como borracha
Créditos da imagem: Qian Liu et al.
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Uma camada elástica de silicone-ZnO confere super-hidrofobicidade à madeira, que se torna resistente até mesmo à pichação.
December 20, 2025 at 1:19 AM
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Estudantes desenvolvem processo inovador de impressão 3D multimetal
Créditos da imagem: Michael Tucker/ETH Zurich
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A nova impressora 3D permite que dois metais diferentes sejam fundidos simultaneamente por um laser na plataforma giratória.
December 20, 2025 at 1:07 AM
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Long Shadows of the Montes Caucasus
Image Credit & Copyright: Guy Bardon
apod.nasa.gov/apod/ap25121...
When the Moon is at its first quarter phase, the Sun rises along the Montes Caucasus as seen from the lunar surface. The lunar mountain range casts the magnificent, spire-like shadows in this telescopic view from planet Earth, looking along the lunar terminator or the boundary between lunar night and day. Named for Earth's own Caucasus Mountains, the rugged lunar Montes Caucasus peaks, up to 6 kilometers high, are located between the smooth Mare Imbrium to the west and Mare Serenitatis to the east. Still mostly in shadow in this first quarter lunarscape, at the left (west) impact craters reflect the light of the rising Sun along their outer, eastern crater walls.
December 19, 2025 at 8:41 AM
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Jupiter and the Meteors from Gemini
Image Credit & Copyright: David Cruz
apod.nasa.gov/apod/ap25121...
Jupiter, the Solar System's ruling gas giant, is the brightest celestial beacon at the center of this composite night skyscape. The scene was constructed by selecting the 40 exposures containing meteors from about 500 exposures made on the nights of December 13 and 14, near peak activity for this year's annual Geminid meteor shower. With each selected exposure registered in the night sky above Alentejo, Portugal, planet Earth, it does look like the meteors are streaming away from Jupiter. But the apparent radiant of the Geminid meteors is actually closer to bright star Castor, in the shower's eponymous constellation Gemini. In this frame that's just a little above and left of the Solar System's most massive planet. Still, the parent body of Geminid meteors is known to be rocky, near-Earth asteroid 3200 Phaethon. And the orbit of Phaethon itself is influenced by the gravitational attraction exerted by massive Jupiter, in concert with planets of the inner Solar System.
December 18, 2025 at 8:09 AM
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After Years of Being 'Man About Town' Cat Finally Decides to Settle Down When He Meets Family of His Dreams
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After Years of Being 'Man About Town' Cat Finally Decides to Settle Down When He Meets Family of His Dreams
After years of being a "man about town," a cat finally decided it was time to settle down when he met the family of his dreams. Chatman aka RocketExploits Valley SPCAFor...
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December 18, 2025 at 5:54 AM