There’s a lot more to the world we live in that what we can see with our eyes. The colours of the world that we see are merely a subset of the wide spectrum of available light, one that extends out in both directions in an infinite expanse of wavelengths. Beyond that there are countless other things happening around us which eyes simply can’t perceive, that is until we construct something that allows us to see the world that’s invisible to us. One such device is called a Cloud Chamber which allows us to see the streams of ionizing radiation that permeate throughout our world. The video below is probably the best example I’ve seen of one and it makes for some extremely soothing viewing:
It’s striking to see the chamber light up constantly with just the background radiation that’s ever present here on earth. Even if you’re familiar with the idea of the world having a constant source of radioactivity it’s still another thing to see it in action, the ionizing particles whizzing through the space at an incredibly rapid pace. Adding in a radioactive source is a great way to visualize what radioactive decay is and how various materials decay at different rates and in different ways.
Cloud Chambers played an important role in the early days of particle physics with the discovery of the positron (the anti-electron) and the muon. There have been numerous improvements to the devices in the time since they were first used with the modern day equivalents being solid state devices, typically cooled to cryogenic temperatures. Unfortunately the modern versions don’t provide as good of a show as their historic counterparts did but we’re able to do much better science with them than we ever were with a cloud chamber.