Do white auroras exist?

To us they are normally white, as at low levels we see in black and white. They are usually a weak and washed out white, AFAIK, to OUR eyes. Perfect white or nearly so is unusual though. read more

Here’s the rundown: We have not yet detected an exoplanet aurora, but there is theory on how to do it. Aurorae emit most of their energy in the ultraviolet and thermal part of the EM spectrum. However, they also emit some very characteristic radio frequencies. read more

If they do exist, white holes should be easy to detect, but they have never been seen. Most physicists think what white holes do not exist, and that something falling into a black hole gets squashed at the singularity and the black hole grows a little larger. read more