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🇧🇷 Tudo sobre Astronomia: Notícias, curiosidades, universo. 🇬🇧 All about Astronomy: News, curiosities, universe. ADMINS 📍 @Aleandra 🤖 @afeedbackbot CREATED 29/2/16 PARTNERS @Guiadev @Portugues @sentoavara @astronomiadadepressao

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🇬🇧 Mysterious X-Ray Emission May Reveal Nature of Dark Matter

X-ray light from the Perseus cluster of galaxies may finally reveal the true nature of one of the most mysterious substances in the cosmos: dark matter.
Dark matter is a bizarre material that does not emit light or energy, yet is thought to make up about 85 percent of the matter in the universe. Researchers use creative and indirect observations to deduce dark matter's presence, but it remains challenging to pin down solid evidence of the substance's existence. Thanks to mounting observations by NASA's Chandra X-ray Observatory, a Japanese-led X-ray telescope known as Hitomi and the European Space Agency's (ESA) XMM-Newton, scientists may be on the verge of a groundbreaking discovery about the mysterious material, researchers said in a statement from the Chandra X-Ray Center in Cambridge, Massachusetts.

The subject of study is the Perseus cluster, a dusty region of galaxies gathered together 250 million light-years from Earth. Scientists estimate that the Perseus cluster is 11.6 million light-years across and that it may contain a whopping 660 trillion times the mass of the sun.
X-ray light from the Perseus cluster of galaxies may finally reveal the true nature of one of the most mysterious substances in the cosmos: dark matter.
Dark matter is a bizarre material that does not emit light or energy, yet is thought to make up about 85 percent of the matter in the universe. Researchers use creative and indirect observations to deduce dark matter's presence, but it remains challenging to pin down solid evidence of the substance's existence. Thanks to mounting observations by NASA's Chandra X-ray Observatory, a Japanese-led X-ray telescope known as Hitomi and the European Space Agency's (ESA) XMM-Newton, scientists may be on the verge of a groundbreaking discovery about the mysterious material, researchers said in a statement from the Chandra X-Ray Center in Cambridge, Massachusetts.

The subject of study is the Perseus cluster, a dusty region of galaxies gathered together 250 million light-years from Earth. Scientists estimate that the Perseus cluster is 11.6 million light-years across and that it may contain a whopping 660 trillion times the mass of the sun.
In 2014, an unusual spike of intensity in X-ray wavelengths caught the attention of researchers using the XMM-Newton space observatory. The waves were coming from heated gas in the Perseus galactic cluster, near the center. Researchers also found that this same wavelength of radiation, known as an emission line, was coming from 73 other galaxy clusters, according to the statement.

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🇧🇷 Uma misteriosa emissão de Raio-X pode revelar a natureza da Matéria Escura

Matéria escura é um material estranho que não emite luz ou energia mas representa cerca de 85% da matéria no Universo. Pesquisadores usam de muitas observações indiretas para deduzir a presença da matéria escura, mas está sendo desafiador encontrar sólidas evidências da sua existência.
Graças a constantes observações do Chandra (NASA), Hitomi (JAXA) e o XMM-Newton (ESA), cientistas podem estar próximos de uma descoberta histórica sobre a misteriosa matéria, diz um dos pesquisadores do Chandra em um comunicado.
O objeto de estudo é o aglomerado de galáxias, Perseus, que fica a 250 milhões de anos-luz da Terra, tem cerca de 11.6 milhões de anos-luz em seu tamanho e contém aproximadamente 660 trilhões de vezes a massa do sol.

Em 2014, um pico atípico de intensidade no comprimento de onda do Raio-X chamou a atenção dos pesquisadores que usavam o XMM-Newton. As ondas vieram do gás aquecido próximo ao centro do aglomerado. Cientistas acharam a mesma radiação vindo de 73 outros aglomerados. Esta mesma observação mostrou a radiação sendo emitida em 3.5 KeV (kiloelectron-volt), e uma nova análise também observou uma absorção de Raio-X, nos mesmos 3.5 KeV, próxima a um buraco negro supermassivo no centro de Perseus. Os pesquisadores acham impossível de explicar o porquê deste comprimento de onda em específico estar sendo emitido e absorvido e porquê objetos anteriormente vistos não deram pistas desta emissão, sugerindo assim que, a matéria escura pode ser a causa.

Se a matéria escura causou estas linhas de emissão e absorção atípicas neste comprimento de onda, futuras observações podem ensinar mais aos pesquisadores sobre essa misteriosa substância.

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🇧🇷 Fato Curioso
A nossa própria galáxia tem uma longa história de colisões com outras. Contém pedaços de várias galáxias mais pequenas que chocaram com ela no passado. De fato, há uma galáxia-anã que se está a fundir com a nossa neste preciso momento!

🇬🇧 Cool Fact
Our own Galaxy has a long history of collisions with others. It contains bits of many smaller galaxies that smashed into it in the past. In fact, a nearby dwarf galaxy is merging with our Galaxy as we speak!

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🇬🇧 John Young in Photos: Astronaut, Moonwalker and Space Shuttle Pioneer

Astronaut John Young, a veteran of six space missions, died Jan. 5, 2018 due to complications with pneumonia. See his storied career, which took Young to the moon and back, then on NASA shuttles, in photos here. In this image, Young is seen during training for his Apollo 16 moon landing mission, which he commanded, in 1971.

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🇧🇷 John Young em fotos: astronauta, homem da Lua e pioneiro do ônibus espacial

O astronauta John Young, um veterano de seis missões espaciais, morreu em 5 de janeiro de 2018 devido a complicações relacionadas à pneumonia. Veja a sua carreira histórica, que levou Young para a lua e outras missões. Nesta imagem, Young é visto durante o treinamento para sua missão de aterragem lunar Apollo 16, que ele ordenou em 1971.

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🇬🇧 To Fly Free in Space

What would it be like to fly free in space? At about 100 meters from the cargo bay of the space shuttle Challenger, Bruce McCandless II was living the dream -- floating farther out than anyone had ever been before.

Guided by a Manned Maneuvering Unit (MMU), astronaut McCandless, pictured, was floating free in space. McCandless and fellow NASA astronaut Robert Stewart were the first to experience such an "untethered space walk" during Space Shuttle mission 41-B in 1984.

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🇧🇷 Voando solto no espaço

Come seria a sensação de voar livre no espaço? A cerca de 100 metros do atracadouro de carga do onibus espacial Challenger, Bruce McCandless II viveu este sonho — flutuar, indo mais longe do que qualquer outra pessoa jamais esteve.

Guiado por uma Unidade de Manobra Trtipulada — Manned Maneuvering Unit (MMU), o astronauta McCandless, nesta foto, flutuava livre no espaço. McCandless e o colega astronauta da NASA Robert Stewart foram os primeiros a experimentar uma "caminhada espacial sem amarras" durante a missão 41-B do Onibus espacial, in 1984.

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🇬🇧 Moon Phases 2018 - Southern Hemisphere - 4K

This 4K visualization shows the Moon's phase and libration at hourly intervals throughout 2018, as viewed from the Southern Hemisphere. Each frame represents one hour. In addition, this visualization shows the moon's orbit position, sub-Earth and subsolar points, distance from the Earth at true scale, and labels of craters near the terminator.

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🇧🇷 Todas As Fases da Lua Para 2018

O vídeo abaixo é uma visualização 4K que mostra todas as fases da Lua e a sua libração para o ano de 2018, como observado do hemisfério sul. Cada frame no vídeo representa uma hora. Além disso, o vídeo mostra também a posição da órbita da Lua, os pontos sub terrestres e sub solares, a distância da Terra até a Lua em escala real, e ainda mostra o nome das principais crateras que aparece no terminador da Lua.

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🇧🇷 O ano mal começou e já temos um belíssimo evento astronômico abrindo o calendário 2018: a Super Lua de Ano Novo! Na verdade estamos em meio a uma série de 3 Super Luas, sendo que a primeira ocorreu em 03 de dezembro de 2017. Agora, a segunda Super Lua da série aconteceu dia 1° de janeiro de 2018. No próximo dia 31 de janeiro teremos a 3ª e última Super Lua do ano, e pra ficar ainda mais especial, nessa mesma noite acontecerá um Eclipse Lunar Total - evento popularmente conhecido como Lua de Sangue.

🇬🇧 The year has just begun and we already have a beautiful astronomical event that opens the 2018 calendar: the New Year's Super Moon! In fact, we are in the middle of a series of 3 Super Moons, the first of which took place on December 3, 2017. Now, the second Super Moon of the series took place on January 1, 2018. On January 31, we will have the 3rd and last Super Moon of the year, and to be even more special, this same night will occur a Total Lunar Eclipse - event popularly known as Blood Moon.

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🇧🇷 Cinturões de Nuvens Coloridas em Júpiter

Os cinturões de nuvens turbulentas e coloridas dominam o hemisfério sul de Júpiter, nessa bela imagem capturada pela sonda Juno da NASA.
Júpiter aparece nessa imagem com cores realçadas como se fosse uma tapeceria com faixas de cores vibrantes e tempestades. A região escura na parte esquerda é chamada de Cinturão Temperado Sul. Interceptando o cinturão podemos encontrar uma feição fantasmagórica de nuvens brancas. Essa é a maior feição nas baixas latitudes de Júpiter que é um ciclone, girando em sentido horário.

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🇬🇧 Gravity: The Force Awakens

You’ve probably heard the phrase “what goes up must come down”, but have you ever stopped to think about why? The answer is ‘gravity’.

Gravity is an invisible force that pulls objects towards each other. Anything that has mass has gravity. Mass is basically how much material something contains. The more mass an object has, the stronger its gravity is.

Some of the largest things in the Universe are galaxies. They are enormous groups containing billions stars, planets, cosmic gas and other stuff.
Despite the huge distances between galaxies their powerful gravity is always at work. It makes them pull at each other and often leads to collisions.

Almost every galaxy will be the victim of a cosmic collision at some point. This could mean that two galaxies crash into one another, like the galaxies in this picture. Or they might just pass close by each other, allowing gravity to pull each galaxy into strange shapes.

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🇧🇷 Gravidade: o despertar da Força

Já ouviram com certeza a frase: “tudo o que sobe tem que descer”; mas alguma vez deram por vós a pensar na razão por trás dela? A reposta é “a gravidade”.

A gravidade é uma força invisível que atrai os objetos uns para os outros. Tudo o que tem massa tem gravidade. A massa, basicamente, é a quantidade de matéria que está contida numa coisa, seja ela qual for. Quanto mais massa tiver um objeto, mais forte é a sua gravidade.

As galáxias são as maiores coisas no Universo. São ajuntamentos enormes, que contêm milhares de milhões de estrelas, planetas, gás e poeira cósmicos, e outras coisas.
Apesar das vastas distâncias que as separam, a sua poderosa gravidade está sempre em acção. Atrai-as umas para as outras, o que muitas vezes conduz a colisões.

Praticamente todas as galáxias acabarão envolvidas numa colisão cósmica nalgum ponto da sua história. Isso pode querer dizer duas galáxias a fundirem-se, como as duas na imagem. Ou duas galáxias podem simplesmente passar próximas uma da outra, fazendo com que a gravidade as distorça de forma bizarra.

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Apollo 10: Command Module Pilot

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🇬🇧 Supermassive black holes control star formation in large galaxies

Every massive galaxy has a central supermassive black hole, more than a million times more massive than the sun, revealing its presence through its gravitational effects on the galaxy's stars and sometimes powering the energetic radiation from an active galactic nucleus (AGN). The energy pouring into a galaxy from an active galactic nucleus is thought to turn off star formation by heating and dispelling the gas that would otherwise condense into stars as it cooled.

This idea has been around for decades, and astrophysicists have found that simulations of galaxy evolution must incorporate feedback from the black hole in order to reproduce the observed properties of galaxies. But observational evidence of a connection between supermassive black holes and star formation has been lacking, until now.


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🇧🇷 Buracos Negros Supermassivos Controlam A Formação de Estrelas nas Galáxias

A maior parte das galáxias massivas possuem no seu centro um buraco negro supermassivo, quando esse buraco negro supermassivo está em processo ativo de acreção de matéria ele é chamado de um núcleo ativo de galáxia.

Nesse caso, parte da matéria ao invés de cair no buraco negro, é acelerada por meio de jatos relativísticos que cortam a galáxia.
Esses jatos de matéria ao passarem pelo gás e pela poeira que forma estrela nas galáxias, esquenta essa região e acaba inibindo o processo de formação de novas estrelas.
Os astrônomos sempre usaram essa ideia nas suas simulações.

Os pesquisadores estudaram galáxias massivas com buracos negros supermassivos centrais, analisaram o movimento das estrelas no centro das galáxias e também determinaram a taxa de formação de estrelas.

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🇧🇷 O Ano Novo está chegando!!
Em cada estrela uma centelha de amor, calor e felicidade.
Desejo a cada um de vocês muito amor, felicidade, paz e boa saúde para 2018!
Obrigada, amantes da Astronomia!!

🇬🇧 The New Year is coming!!
In every star a spark of love, warmth and happiness.
I wish each one of you lots of love, happiness, peace and good health for 2018!
Thanks, Astronomy lovers!!

Aleandra ^^

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