OK, so everyone knows that looking directly at the sun is bad.
But here in Southern California yesterday, the sky was smoky enough that the sun appeared as a red disk in the sky; not at all bright. I could look right at it, and could actually see the sunspots on it. It was pretty cool.
I told my friend about this and said he should check it out. He told me that it could damage your eyes, no matter how bright it actually appeared.
I was always under the impression that the brightness of the sun was what was actually damaging; Is there something else (e.g. invisible radiation) that could have damaged my eyes from looking at it yesterday? Are we just asking to be blinded whenever we look at a sunset?