Rubens Machado

Later today, I'll do an introductory lecture on planet motion in the solar system. Here is an animation I prepared for that. It shows, to scale, the orbits and motion of Earth and Mars. The yellow line is the direction in which we here on Earth observe Mars. And as you can see in the video, 1/ 🧪🔭🎢

Bose 18h, depois de cinco anos

A solução que encontrei pra bloquear o máximo possível foi usar três coisas *simultaneamente*:

1. protetor auricular (Nexcare 3M)
2. fone com cancelamento de ruído (Bose)
3. tocar um mp3 de som de chuva (balanceado pra suprimir agudos e acentuar graves)

The first paper (arxiv.org/abs/2508.21126) presenting our new set of galaxy formation simulations is now out!

This is the culmination of years of work by a large team.

The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations.

(Sound on!)

search box image on paper, buttons below text field say: google search and i'm feeling lucky more google! says the next link copyright ©1999 google inc. google (www.google.com) is a pure search engine — no weather, no news feed, no links to sponsors, no ads, no distractions, no portal litter. nothing but a fast-loading search site. reward them with a visit.

in hindsight we probably should have seen this was a trap, but everything was so new and we were still just kids

Screenshots of websites pages arranged in a collage

Antique and color posters

Closeup of antique poster

Closeup of color poster

New: I recreated Tomas Wright’s 1742 astronomical treatise, Clavis Cælestis, and its accompanying sheets titled A Synopsis of the Universe. New posters are available in antique style and modern colors.

Explore: www.c82.net/clavis-caele...
How it was made: www.c82.net/blog/?id=99

I uploaded this plot to wikimedia commons commons.wikimedia.org/wiki/File:Ex...

A diagram with the cosmological parameters Omega_m on the x axis and Omega_Lambda on the y axis. Different regions correspond to: open / flat / closed, eternal expansion / collapse, acceleration / deceleration, no Big Bang in the corner. Inset plots show sketches of scale factor as a function of time.

The expansion of the Universe depends on its content. Here's an illustration of possible fates, according to the combinations of how much total matter and dark energy there is. Our Universe is the red dot with Omega_m=0.3 and Omega_Lambda=0.7, meaning flat geometry and eternal accelerated expansion.

Almost certainly being paranoid, but astronomers: someone outside the US has ADS backed up, right?

#PhysicsFactlet
If you put apertures of different shapes in the path of a plane wave, you get different diffraction patterns. And with a bit of experience you can say a lot about the aperture shape just by looking at the diffraction pattern.
#Physics #Optics #Photonics #ITeachPhysics

World's darkest and clearest skies at risk from industrial megaproject On December 24th, AES Andes, a subsidiary of the US power company AES Corporation, submitted a project for a massive industrial complex for environmental impact assessment. This complex threatens the pristine skies above ESO’s Paranal Observatory in Chile’s Atacama Desert, the darkest and clearest of any astronomical observatory in the world [1]. The industrial megaproject is planned to be located just 5 to 11 kilometres from telescopes at Paranal, which would cause irreparable damage to astronomical observations, in particular due to light pollution emitted throughout the project’s operational life. Relocating the complex would save one of Earth's last truly pristine dark skies.

The skies above Paranal are at risk from a proposed industrial megaproject. 

This would be located in the vicinity of ESO's Observatory. If constructed, it would irreparably impact astronomical observations.

Read more: https://www.eso.org/public/news/eso2501/
🔭 

📷 ESO/P. Horálek

This image shows the hourglass shape of the nights shortening and lengthening from winter to summer and from summer to winter, passing clouds, the Moon passing through the night sky every month (diagonal bands) and the Sun climbing higher in the sky during summer.

For the 4th year in a row, my all-sky camera has been taking an image of the sky above the Netherlands every 15 seconds. Combining these images reveal the length of the night changing throughout the year, the passage of clouds and the motion of the Moon and the Sun through the sky. #astrophotography

Blog post by our Editor-in-Chief, @telescoper.bsky.social

astro.theoj.org/post/2822-th...

A captivating image showcasing the interacting galaxies NGC 2207 and IC 2163. The larger spiral galaxy, NGC 2207, dominates the left side of the image with its bright core and swirling arms. To the right, the smaller companion galaxy, IC 2163, appears distorted by the gravitational pull of its larger neighbor. Long, graceful tidal tails of stars and gas stretch across the image, highlighting the dynamic nature of this galactic encounter. The image reveals a stunning interplay of light and shadow, with vibrant blue and white hues dominating the galaxies and contrasting with the inky black backdrop of space.

Another awesome JWST/MIRI data processing of dancing galaxy pair NGC 2207 + IC 2163, this time by @thocarp.bsky.social
www.flickr.com/photos/19746...
🔭 🧪

Em 2004, o Gmail tinha um armazenamento revolucionário e dizia especificamente: "never delete another email". Nós acreditamos, mas infelizmente era mentira. Fomos otários de cair na cilada dessa empresa.

Se os europeus quisessem corrigir o calendário acadêmico deles, bastaria tirarem férias de verão em julho ao invés de agosto. É pedir muito? 🤷‍♂️

Aliás, acho que nosso calendário acadêmico é bem melhor. Começa no começo do ano e termina no fim. Primeiro tem o primeiro semestre e depois tem o segundo semestre, nessa ordem. Férias no meio do ano. Só tem vantagens.

Realmente, antes de chegar na UTFPR, eu nunca tinha ouvido o termo pós-doutorado ser usado pra professor com cargo permanente.

This image shows a spiral galaxy, likely NGC 1566, also known as the Spanish Dancer. The galaxy is located about 60 million light-years away in the constellation Dorado. It is a Seyfert galaxy, meaning it has an active nucleus powered by a supermassive black hole. The galaxy is characterized by its bright blue core and prominent spiral arms.

Galaxy NGC 1566, viewed in mid-infrared as taken by JWST's MIRI.
Processed by @thocarp.bsky.social
www.flickr.com/photos/19746...
🔭 🧪

Here is a little video going back and forth between the two images, and what they tell us about how gas is distributed within that galaxy. (Hint: In the spiral arms, but not the central "bulge".) 2/

My name is Machado and I approve this message

Diretoria da SAB com Marina Freitas, homenageada durante a abertura da reunião anual por seu longo trabalho na secretaria da sociedade.

Relatório de atividades FAPESP mostra que as demandas da comunidade científica recuperaram fôlego em 2023 bit.ly/4ggLIX8

#fomento #investimento #bolsas

opção 2
Embora essa definição de "initiation" (admitting someone into a secret or obscure society) não seja de todo inválida 🙃

Scopus should be banned I think it's time to provide an update on the (lack of progress) getting The Open Journal of Astrophysics properly indexed in Scopus (which markets itself as a purveyor of "metrics you can trust"). Yo...

telescoper.blog/2024/09/05/s...

Como era o site da Sociedade Astronômica Brasileira @sabastronomia.bsky.social em 1997

web.archive.org/web/19970724...

you may not like it, but this is what peak webdesign looks like

Pode ser útil deixar público, especialmente para alunos que não têm uma página institucional onde seja fácil encontrar o email para contactar a pessoa.

No Currículo Lattes, tem como configurar a visibilidade de certas informações. Em particular, dá para deixar público o email, indo em:

Dados gerais > Endereço > Eletrônico > e-mail para contato > [Privado/Público]

buscatextual.cnpq.br/buscatextual...

You (Might) Spin Me Right Round (The Cluster Center) Today’s authors spin up simulations that could explain the unique radio structure in NGC 6166.

From @lcgordon.bsky.social: Today’s authors spin up simulations that could explain the unique radio structure in NGC 6166. 🔭✨️

astrobites.org/2024/09/03/n...

One thing I love about arxiv.org is that, even though you know that their backend has improved massively over the years, their frontend and UI has not changed : it's simple, works with little bandwidth, and *you know exactly where everything is*. None of this constant redesign shit we get elsewhere.