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?

Question

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?

In: 2123

Answer 1

We’ve known for decades there is a 9th “planet”. The only debate is over what’s considered a “planet”. There’s no right or wrong answer, but we discovered a lot more objects that are more similar to Pluto than Pluto is similar to the other 8. Mainly based on size and proximity to the sun. There’s no correlation with our ability to “detect stars”.