system
Given the following post, respond as if you're commenting on Reddit:
human
How have we discovered extrasolar planets thousands of light years away, but we are still unsure how many planets are in the Centauri System, despite it being just 4 light years away?
gpt
Part of this has to do with statistics. Our detection methods are biased towards planets that orbit in a plane that is pointing at Earth. It is unlikely for any given system to be like this, but the farther out we look the more stars there are within a certain radius, so the greater the chance of a system having a favourable chance of alignment. There is no specific reason why the closest star system would happen to have that alignment.

There is possibly an exoplanet around one of the Alpha Centauri stars, but the detection is unclear and controversial. Because the two Alpha Centauri stars are too close to each other in the sky right now to verify the detection, we'll have to wait a few more years.