The ATLAS detector at the LHC is about half the size of St Paul’s cathedral. The picture of me on this page has part of the ATLAS detector in the background. It weighs 7000 tonnes and is the largest particle detector ever constructed.
I have used satellites in space that are the size of a coach, and a telescope in Hawaii that is 10-metres in diameter – but I suspect Lily has used the biggest human-made “experiment” of all of us, as the LHC is pretty vast!
I suppose technically I do experiments with stars, which are pretty huge (e.g. Sun is 1.2 million km in diameter, and some of the stars I work on would fill the solar system out to Saturns orbit), and I weigh black hole sthat are 20 time sthe mass of the Sun – does that count??
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