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A comment on A 1980s space telescope may have seen planet nine. Parent comment

Re:A 1980s space telescope may have seen planet nine by widforss on Wednesday November 17, 2021 @04:03AM (#29250554)
If that is the threshold for discovering exoplanets, haven't we already found Planet Nine since we definetly have detected the planet's effects?
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Re:A 1980s space telescope may have seen planet nine by raxxorrax on Wednesday November 17, 2021 @07:19AM (#29252092)
Good objection actually. We could say that we found exoplanets visually, can determine its mass and size and therefore its density and make careful prediction about its characteristics from that, which is probably nothing more than an educated guess.

Here we just found its gravitational effect.

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