- Other media that I didn't use:
- Radio
- Stars emit photons in every wavelength range.
- Stars emit radio waves and like visible light, they do a good job of penetrating the atmosphere. It is for this reason that we have large radio telescopes here on Earth, but not X-ray, infrared, or gamma ray telescopes, which have to go in space.
- The Earth's atmosphere lets through visible light and radio waves more than other parts of the electromagnetic spectrum
- WWI Radio links:
- https://earlyradiohistory.us/sec015.htm
- https://www.bbc.com/news/uk-wales-27894944
- https://www.npr.org/sections/parallels/2017/04/02/521792062/from-wristwatches-to-radio-how-world-war-i-ushered-in-the-modern-world
- https://eandt.theiet.org/content/articles/2014/06/ww1-first-world-war-communications-and-the-tele-net-of-things/
- https://earlyradiohistory.us/sec013.htm
- https://dp.la/exhibitions/radio-golden-age/radio-frontlines/?item=673
- Embeddable simulation of how Radio waves travel:
- Infrared
- Visible spectrum
- What reveals the invisible laws of light? Blow smoke onto a tree that is silhouetted by a night when there's fog in the air.
- The reason why our perception falls within this general range and not another may have a lot to do with our atmosphere. Our main source of light has always been the sun, and only the wavelengths of lower end UV, the visible spectrum, higher end IR, and radio waves get through.
- Seeing radio waves would not have been useful in our natural environment, as their wavelengths are the size of buildings. We wouldn't be able to see the world of our size in any detail whatsoever.
- So, all animals end up with a subjective 'visible spectrum', but it still falls within the same magnitude as each other.
- Ultraviolet
- Aurora at Jupiter's north pole as seen in ultraviolet light by the Hubble Space Telescope.
- Wikipedia, Ultraviolet
- X-ray
- Early radiologist would calibrate their X-ray machines by slowly running their hand under the beam in 30 second intervals. This image shows the damage that usually required finger amputation. Source: Lindsey Fitzharris
- https://www.reddit.com/r/Damnthatsinteresting/comments/aq1nk4/early_radiologist_would_calibrate_their_xray
