The particle that moves rapidly in all directions in the space outside the nucleus is called an electron.

Here's why:

* Electrons are negatively charged particles that orbit the nucleus of an atom.

* They move at extremely high speeds in a region called the electron cloud, which is a probabilistic region where the electron is most likely to be found.

* The electron cloud is not a fixed orbit, but rather a fuzzy area where the electron's position is uncertain.

Let me know if you have any other questions!