With thanks to Hank Green and _3Jane, I fell down a rabbit hole: https://bsky.app/profile/hankgreen.bsky.social/post/3lefcief4kk2m
Venus is bright enough to cast visible shadows
This struck me as both obvious and also very surprising. Obvious because "visible" is load bearing -- anything that emits visible light casts a shadow, you just need sensitive equipment to see it and get rid of unwanted light. On the other hand, if "visible" here means "with the naked eye", then that's wild. I had to know more.
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