Although, at a fundamental level, the Universe is made up of point-like quantum particles, they assemble together to create objects of finite sizes and masses, occupying specific amounts of volume. This artist’s illustration shows several electrons orbiting an atomic nucleus, where the electron is a fundamental particle, but the nucleus can be broken up into still smaller, more fundamental constituents. Whether there are structures on scales smaller than the presently known subatomic particles remains to be discovered. (Credit: Shutterstock)

The idea that matter is mostly empty space is mostly wrong

Practically all of the matter we see and interact with is made of atoms, which are mostly empty space. Then why is reality so… solid?

One thing you can be sure of, as you measure and observe the Universe around you, is this: the physical objects you see, touch, and otherwise…