Why we can accurately detect stars billions of light years away, but we can’t confirm if we have a 9th planet in our solar system?

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Why we can accurately detect stars billions of light years away, but we can’t confirm if we have a 9th planet in our solar system?

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Because you can pick pretty much any direction to look and there will be stars. With Planet 9 you have to know *exactly where to look* to see it and we don’t. It’s sort of like the difference between “find any one person in New York City” and “find this one specific person in New York City.” Add to that the relative dimness others have mentioned and the fact that a lot of the equipment that’s spotting distant stars can’t adequately focus on much nearer and dimmer things.

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