It's not really about the frequency of light. We pretty much have "discovered" all frequencies -- it's the electromagnetic spectrum. We know all of the frequenc

It's not really about the frequency of light. We pretty much have "discovered" all frequencies -- it's the electromagnetic spectrum. We know all of the frequencies that exist. The trick is devising new methods with increasingly sensitive instrumentation. This article talks about how researchers looked at measurements taken from space to gauge where the sea level was a mere few-centimeters higher than the surrounding area! Incredible! In theory, I could have seen someone like Arthur C. Clarke proposing this half a century ago - but with the precision in instrumentation only becoming available today, the idea could have been proposed long before the technology existed. In the future, might we devise a method and accompanying instrumentation that will allow us to map the sea floor with just a regular flash light hung from a ship? Maybe (but probably not). Point being: It's the methodology + instrumentation, not the frequency of light itself.