On 1 October 1992, ATLAS submitted its Letter of Intent to the LHC Experiments Committee. The approval of the ATLAS Experiment was an important milestone in the history of particle physics – but it was just the first step in a long journey. Making ATLAS a reality required years of innovative developments in technology and physics.

To celebrate its 25th anniversary, ATLAS is hosting a series of Facebook live events today, Monday 2 October 2017. Explore key locations around CERN – including the ATLAS control room, Building 40 and the ATLAS TileCal workshop – while learning about the physics, construction and history of the experiment.

Watch the Facebook live events below!

To conclude the day, ATLAS' Steven Goldfarb and Julia Gonski answers questions in a live Q&A:

Learn about the upgrade of the ATLAS detector for High-Luminosity with ATLAS physicists Martin Aleksa and Brian Petersen:

Technical Coordinator Ludovico Pontecorvo discusses installation and operation of the ATLAS detector:

Exploring the Standard Model and the Higgs boson with ATLAS Physicists Ludovica Aperio Bella and Clara Nellist:

ATLAS physicists Reina Camacho Toro and Stephane Willocq discuss the search for new physics: 

Former ATLAS spokesperson Peter Jenni explores the history of the ATLAS Collaboration: