atdavid
Be good GK, or I will have to take marks off for bad behaviour. Ever notice that X-ray telescopes are only at very high altitudes or space based, but you can get pretty good visible light resolution at ground level. Turns out much visible light passes almost unhindered through the atmosphere, but X-rays are blocked, even though higher energy ..... hmm...
>>>>Did you ever notice that the CD laser isn’t really red? It’s infrared, 780 nm. It only looks red 🚨 as a safety precaution. (You know audiophiles!). That’s why a considerable amount, let’s say 25%, of the scattered laser light that gets into the detector is visible red. Which is why the Green Pen around the outer edge is audible. Agree? Disagree? Talk amongst yourselves.