Asked by: Liam Farmer, Birmingham
It’s the generic name physicists give to matter with weird properties. Exactly how weird depends on the area of physics. For example, those working in cryogenics – the study of ultra-cold temperatures – work with so-called superfluids, isotopes of helium whose quantum properties allow them to defy gravity, escaping from containers by creeping up and over the walls.
But the oddest forms of exotic matter are those investigated by cosmologists, such as the true identity of so-called dark matter. This is widely considered to pervade galaxies, and is thought to be some form of exotic particle quite unlike the protons, neutrons and electrons making up standard matter.
Robert is a science writer and visiting professor of science at Aston University.