Eli5 When we look at a star 10 LY away, are we seeing 10 LY away or are we just seeing the light when it reaches us, or is it a mix?

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Title pretty much covers the question.

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Anonymous 0 Comments

I mean, its the second thing.

You see light when that light hits your eyeballs, and your eyeballs are (hopefully) where you are.

That’s why we say we see stuff as it looked like “in the past.” That light from a star 10 LY is light that was emitted 10 years ago back at that star, weird freaky relativity stuff not withstanding.
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