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Listening to the Universe: Building the Einstein Telescope
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In 2015, humanity heard the universe for the first time. Two black holes, more than a billion light-years away, spiralled into each other and sent a ripple through the fabric of spacetime itself — a signal so faint that measuring it meant detecting a change smaller than a thousandth of the width of a proton. We caught it. That detection opened an entirely new way of observing the cosmos, and it earned a Nobel Prize.
The Einstein Telescope is the next chapter. It is a third-generation gravitational-wave observatory: more than 30 kilometres of tunnels, 250 metres underground, laser interferometer arms 10 kilometres long, cooled and isolated from every passing truck and every distant earthquake so it can listen ten times more sensitively than anything we have today. And there is a real chance it gets built right here, beneath the Euregio Meuse-Rhine, a short drive from where we are sitting.
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This keynote is an invitation into that project — for people who build systems for a living, but whose day job is not colliding black holes. I want to show you what it actually takes to measure the unmeasurable: the physics of gravitational waves, why we have to go so deep and so cold, the mind-bending engineering and data challenges of an instrument at this scale, and what a machine like this will let us hear that no telescope ever could — neutron stars tearing apart, supernovae collapsing, and maybe echoes from the first moments after the Big Bang.
No physics degree required. Just bring your curiosity about how we turn a whisper from the edge of the universe into data.
