Avanços no ELT
A Fotografia da Semana de hoje mostra um marco emocionante: rodou-se pela primeira vez a enorme estrutura de altitude do Extremely Large Telescope (ELT) do ESO, em Outubro de 2026. Para obter a amplitude total de movimento que permitirá ao ELT apontar para qualquer ponto do céu do hemisfério sul, o telescópio tem de rodar sobre dois eixos diferentes: o eixo vertical ou azimutal e o eixo horizontal ou de altitude. Há alguns meses atrás, tínhamos já feito rodar o ELT pela primeira vez em torno do seu eixo vertical e agora com a realização da rotação em torno do eixo horizontal, demos mais um passo em frente na construção do enorme telescópio.
A estrutura de altitude foi colocada sobre as suas almofadas de apoio hidrostáticas, onde as superfícies deslizantes que permitem a rotação estão separadas por uma película muito fina de óleo pressurizado para eliminar o atrito. A estrutura, que irá suportar os cinco espelhos do ELT, incluindo o seu enorme espelho principal de 39 metros, é extremamente pesada, tendo sido construída com quase duas mil toneladas de aço. Parece quase impossível que esta estrutura flutue sobre uma camada de óleo minúscula: cerca de 120 milésimas de milímetro neste primeiro teste e apenas 80 milésimas de milímetro no futuro, ou seja, muito mais fina do que a espessura dum cabelo humano. O facto desta estrutura gigantesca poder ser movida com tanta suavidade ao mesmo tempo que mantém a sua rigidez, corresponde a um verdadeiro feito da engenharia moderna. Depois ter sido rodado sobre o seu eixo horizontal, o telescópio foi seguidamente devolvido à sua posição vertical inicial.
"O primeiro movimento a que submetemos a estrutura constituiu apenas uma ligeira oscilação de alguns centímetros em torno da sua posição de equilíbrio", afirma Roberto Tamai, Gestor do Programa ELT, que esteve presente no local. "Ao observá-lo, tive a maravilhosa sensação de embalar suavemente um bebé no seu berço. Sem dúvida, um bebé bastante pesado! Parabéns a todos os que tornaram isto possível. O nosso bebé ganhou finalmente vida! Que tenha uma vida longa, ativa e bem-sucedida, explorando as maravilhas do Universo!"
Links
Créditos:ESO/Cimolai/Apical/G. Vecchia
Sobre o vídeo
| Id: | potw2643a |
| Língua: | pt |
| Data de divulgação: | 26 de Outubro de 2026 às 06:00 |
| Duração: | 20 s |
| Frame rate: | 25 fps |
Sobre o objeto
| Nome: | Extremely Large Telescope |
| Tipo: | Unspecified : Technology : Observatory : Telescope |
Our use of Cookies
We use cookies that are essential for accessing our websites and using our services. We also use cookies to analyse, measure and improve our websites’ performance, to enable content sharing via social media and to display media content hosted on third-party platforms.
ESO Cookies Policy
The European Organisation for Astronomical Research in the Southern Hemisphere (ESO) is the pre-eminent intergovernmental science and technology organisation in astronomy. It carries out an ambitious programme focused on the design, construction and operation of powerful ground-based observing facilities for astronomy.
This Cookies Policy is intended to provide clarity by outlining the cookies used on the ESO public websites, their functions, the options you have for controlling them, and the ways you can contact us for additional details.
What are cookies?
Cookies are small pieces of data stored on your device by websites you visit. They serve various purposes, such as remembering login credentials and preferences and enhance your browsing experience.
Categories of cookies we use
Essential cookies (always active): These cookies are strictly necessary for the proper functioning of our website. Without these cookies, the website cannot operate correctly, and certain services, such as logging in or accessing secure areas, may not be available; because they are essential for the website’s operation, they cannot be disabled.
Functional Cookies: These cookies enhance your browsing experience by enabling additional features and personalization, such as remembering your preferences and settings. While not strictly necessary for the website to function, they improve usability and convenience; these cookies are only placed if you provide your consent.
Analytics cookies: These cookies collect information about how visitors interact with our website, such as which pages are visited most often and how users navigate the site. This data helps us improve website performance, optimize content, and enhance the user experience; these cookies are only placed if you provide your consent. We use the following analytics cookies.
Matomo Cookies:
This website uses Matomo (formerly Piwik), an open source software which enables the statistical analysis of website visits. Matomo uses cookies (text files) which are saved on your computer and which allow us to analyze how you use our website. The website user information generated by the cookies will only be saved on the servers of our IT Department. We use this information to analyze www.eso.org visits and to prepare reports on website activities. These data will not be disclosed to third parties.
On behalf of ESO, Matomo will use this information for the purpose of evaluating your use of the website, compiling reports on website activity and providing other services relating to website activity and internet usage.
Matomo cookies settings:
Additional Third-party cookies on ESO websites: some of our pages display content from external providers, e.g. YouTube.
Such third-party services are outside of ESO control and may, at any time, change their terms of service, use of cookies, etc.
YouTube: Some videos on the ESO website are embedded from ESO’s official YouTube channel. We have enabled YouTube’s privacy-enhanced mode, meaning that no cookies are set unless the user actively clicks on the video to play it. Additionally, in this mode, YouTube does not store any personally identifiable cookie data for embedded video playbacks. For more details, please refer to YouTube’s embedding videos information page.
Cookies can also be classified based on the following elements.
Regarding the domain, there are:
- First-party cookies, set by the website you are currently visiting. They are stored by the same domain that you are browsing and are used to enhance your experience on that site;
- Third-party cookies, set by a domain other than the one you are currently visiting.
As for their duration, cookies can be:
- Browser-session cookies, which are deleted when the user closes the browser;
- Stored cookies, which stay on the user's device for a predetermined period of time.
How to manage cookies
Cookie settings: You can modify your cookie choices for the ESO webpages at any time by clicking on the link Cookie settings at the bottom of any page.
In your browser: If you wish to delete cookies or instruct your browser to delete or block cookies by default, please visit the help pages of your browser:
Please be aware that if you delete or decline cookies, certain functionalities of our website may be not be available and your browsing experience may be affected.
You can set most browsers to prevent any cookies being placed on your device, but you may then have to manually adjust some preferences every time you visit a site/page. And some services and functionalities may not work properly at all (e.g. profile logging-in, shop check out).
Updates to the ESO Cookies Policy
The ESO Cookies Policy may be subject to future updates, which will be made available on this page.
Additional information
For any queries related to cookies, please contact: pdprATesoDOTorg.
As ESO public webpages are managed by our Department of Communication, your questions will be dealt with the support of the said Department.