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Image Astro du jour
Today’s Picture of the Week shows an exciting milestone: the massive altitude structure of ESO’s Extremely Large Telescope (ELT) was tilted for the first time in October 2026. To get the full range of motion that will allow the ELT to point anywhere in the Southern sky, the telescope needs to rotate on two different axes: the vertical or azimuthal axis and the horizontal or altitude axis. A few months ago, the ELT rotated on its vertical axis for the first time, and this new milestone, tilting on its horizontal axis, is another step in the right direction.
The altitude structure was lifted onto its hydrostatic bearing pads, where the sliding surfaces that allow for rotation are separated by a thin film of pressurised oil to remove friction. The framework that will hold the ELT’s five mirrors, including its huge 39-m main mirror, is incredibly heavy, built from nearly 2000 tonnes of steel. It feels almost unbelievable that this structure floats on a microscopic layer of oil: about 120 microns thick in this first test, and only 80 microns in the future – thinner than a human hair. It is a feat of modern engineering that this gigantic structure can move so smoothly while retaining its stiffness. After the telescope was inclined it was then returned to its upwards position.
“The very first movement was just a gentle oscillation of a few centimetres around its balanced position,” says Roberto Tamai, ELT Programme Manager, who was present at the site. “Watching it, I had the wonderful feeling of gently rocking a baby in its cradle. A rather heavy baby, indeed! Well done to all who made this possible. Our baby has finally come to life! May it have a long, active and successful life, exploring the wonders of the Universe!”
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Standalone time-lapse clips (1, 2, 3)
Standalone still images (1, 2, 3)