World's largest telescope rises in Chile, set to unlock the mysteries of the cosmos

Time of India

12-05-2025

Source: ESO
There is magic in gazing at the stars—an ancient human pursuit that inspires us to wonder and ask questions. Now place yourself in the sparsely populated Chilean desert, under one of the planet's best viewing night skies, as a gigantic telescope begins to rise. This is the drama that's unfolding in the
Atacama Desert
, where the
European Southern Observatory
(ESO) is building a scientific wonder: the
Extremely Large Telescope
(ELT).
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When finished, it will be the world's
largest optical telescope
, an engineering marvel that will transform our perspective of the universe.
An extremely large telescope emerges beneath a starry sky
An ethereal photograph recently taken by one of ESO's public live webcams is a dreamlike blend of nature and science. The image shows the ELT worksite illuminated by the Milky Way's bright stripe. A crane cable slices across the frame like a tight fishing line, hanging still as if grasping for the stars themselves. Inside the bony white skeleton of the half-constructed dome, support beams etch what will be an unprecedented scientific instrument.
The bulging outlines of the telescope's enormous dome doors, around the center, are taking form. When they are working, those doors will be playing an important role: safeguarding delicate optics from searing dust particles and blasting desert winds without inhibiting the telescope from casting its gaze out into the universe in unparalleled precision.
Recorded by ESO's live build webcam, the picture doesn't even suggest the size of this behemoth undertaking. When finished, the ELT dome will rise 80 meters high—about as high as Big Ben without its spire. For reference, construction equipment parked at ground level seems minute compared to the gargantuan structure. But the scale is not just physical—it's astronomical. When it comes online, the ELT will collect more light than any optical telescope currently on the planet, allowing scientists to glimpse the universe in ways previously unimaginable. Its potential will shed light on everything from how the first galaxies gave birth to our cosmos to the atmospheres of exoplanets that could harbor life.
How the ELT invites the world to witness its creation
What is so easy about this project is the way it is open to the public. With ESO's live webcam facility, anyone, anywhere in the world, can watch the ELT being built as it happens. You can stay at home and watch every bolt screwed, every beam levelled—every milestone reached. It's a once-in-a-lifetime opportunity to witness a giant of science taking shape before your eyes, under the watchful eyes of stars which have stood guard over humankind for thousands of years.
The ELT represents more than just a technological leap—it's a symbol of humankind's enduring quest to understand the universe. Set against the backdrop of one of Earth's most pristine night skies, this telescope is a bridge between past and future, Earth and cosmos. As the construction continues, and the dome slowly closes in on completion, we're reminded that even the grandest achievements begin with the quiet placement of steel beams—watched over by the stars.
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