Comment by ccgreg

In my most recent trip through academic astronomy, not only do they say "visible light" early and often, radio astronomers refer to "optics" and "photons" and VLBI images are called "images" and not "maps".

It's not that wildly different from the 1980s -- even then I never heard anyone say something like:

> Of course, everything radiates, and everything radiates light if you heat it up enough (> 500°C, > 1000°F).

Like, literally, in an undergraduate class that I taught, one of the short-answer questions on the midterm was to ask what kind of light the teacher's hair emitted. The answer is, of course, infra-red light.