Famous theories about deep space and astronomy that have been proven to be wrong

I think most of what Immanuel Velikovsky, mid century catastrophist and chronological revisionist, espoused fits the OP’s requirements.

Here’s a selection of conversations with Einstein.

http://www.varchive.org/bdb/main.htm

Jeez, why not bring up John Cleves Symmes, Jr. while you’re at it? He believed that the earth is hollow and we live on the inside. That is good science compared to Velikovsky. No competent scientist at the time thought Velikovsky was anything other than a crank. He was a scientist the way anti-vaxers are scientists and his attitude toward facts would embarrass a moon-hoaxer. And Einstein crushed him like a bug.

I’m 95% sure it was Scientific American, but that article does look kind of familiar. I went to the lecture several years back.

5 degrees is an 8.7% climb, or 1 in 11.4. It’s not exactly a challenging climb, but definitely looks and feels like a slope. It’s slightly steeper a wheelchair ramp allowed to be by the ADA.

My God, wait until Ambivalid finds out! :smiley:

Yeah, I didn’t mean due to its slope you wouldn’t know you were climbing. I was saying it has a shallow slope and, as a separate point, from sight alone you would not know you were climbing.

I’m pretty sure the ADA allows slopes of 9% on Mars because of its lower force of gravity.