Reality Check: An Astrophysicist's View of Reality with Geraint Lewis Part One (488)

On a stage in Sydney, astrophysicist Geraint Lewis laid out an unsettling truth: the scientific revolution has revealed that reality is nothing like our day-to-day experience leads us to believe. Air is not a fundamental substance but a swarm of tiny particles. Atoms are mostly empty space. And the deeper physicists dig, the weirder things get — with 95% of the universe composed of stuff we cannot identify.

The Incomplete Picture of Matter

Lewis begins with a simple observation that would shock someone from 500 years ago: the air around us, the ground beneath us, and our own bodies are all made from the same universal stuff — atoms. But that picture is far from complete. The periodic table lists 92 natural elements, and the Standard Model of particle physics describes their building blocks (quarks and electrons) with extraordinary precision. It predicts what happens at the Large Hadron Collider flawlessly.

Yet the Standard Model has glaring holes. It cannot explain why neutrinos have mass. It has nothing to say about dark matter or dark energy. And these are not minor gaps. Dark matter makes up about 25% of the universe, and dark energy another 70%. Together, physicists have no idea what constitutes 95% of everything that exists. As Lewis puts it, science would be boring if we knew everything — but the scale of our ignorance is staggering.