Recently have been binge-ing on planets and cosmos, and I saw this youtuber mentioned that we might discover the next planet after Neptune.
However from my understanding, humanity has discovered black holes, magnetars, stars and so on that are hundreds, thousands or even more than that in terms of the measurement of light years.
Our solar system is not in the measurement of light years, yet we can’t discover the next planet after Neptune. Why ?
In: Technology
Galaxies, etc. have the benefit of being extremely large and extremely bright. It is sort of like how you have trouble spotting your keys dropped in your lawn in the middle of the night, but it is very easy to spot a forest fire from even miles away in the night.
A planet for example might only be a few thousands of kilometers across, while galaxies are more like a hundred thousand light years. They are also blasting light out from the ongoing fusion reactions of their constituent stars, while planets are just sort of floating in the pitch black, only radiating back the little heat they absorb from the sun.
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