Frankly I'm sure many people knew this. I'd hardly call someone who didn't know "ignorant" because knowing this has little or no bearing on daily life. Most people's knowledge of space or astronomy comes from school--most likely elementary and high school--so once they leave that period in their life there not as likely to keep up with the changes in theories.
Yes the media doesn't cover it as much as it used to, probably because the advancements are much more marginal than say--when man first landed on the moon. Just my 2 cents
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