We don't really know what lies beyond the Kuiper belt. The Voyager probes haven't shown anything so far but that doesn't mean much. The so called Kuiper cliff may be explained by a planet clearing its neighborhood.
>>7650666 There are most likely dozens of small icy worlds like pluto floating around out there in the kuiper belt that we haven't seen yet.
And im still willing to believe there is something huge in the Oort cloud on a highly elliptical millions of year long orbit. As the object moves through the cloud its gravitational protuberance throws rocks and debris into the inner solar system which explains the periodic mass extinction events that have hit the earth.
>>7650666 >Are there any unknown planets in our solar s system we don't know of exist?
It's extremely unlikely for two reasons:
1. Any planets of noticeable mass are already known from the way they disturb the 'inner' solar system (as defined by the solar system inside the Oort Cloud).
2. Any planet within the Oort Cloud which is of what we consider to be of 'planetary size' has probably not passed the planet test anyway, since by being in the Oort, it's unlikely to have cleared out its orbital path, to wit:
Gas giants of Saturn/Jupiter size have been ruled out on the basis of comet origination data. However, there might still be Neptunes out there. And then we have to deal with the unknown data of "rogue" planets, which are in the interstellar void.
>>7651405 Its almost a given that everything past Neptune hasn't cleared it's orbital neighborhood. Ditch the IAU definition of a planet. many agree it's stupid anyway.
Call anything with Hydrostatic Equilibrium that isn't a star a planet. If the planet orbits another planet directly, we'll call that a moon. If two planets orbit each other via a barycenter call that a double planet.
>>7651261 I never got this theory. It seems like most of the object flungs our way would miss, so the mystery planet would need to orbit hundreds of times before it fling the right asteroid the right way. At that point, any periodicity will be lost in the noise.
>>7650666 >any unknown planets in our solar s system we don't know of exist? >any unknown planets >we don't know of >unknown >don't know You're asking about stuff we don't know. how do you except us to know?
>>7651405 >2. Any planet within the Oort Cloud which is of what we consider to be of 'planetary size' has probably not passed the planet test anyway, since by being in the Oort, it's unlikely to have cleared out its orbital path, to wit:
Discovering a planetary sized object between Pluto and the inner Oort cloud would require the IAU to look at the definition of planet again. It would also likely require the region between the Kuiper belt and Oort cloud to be considered a separate entity instead of being the inner region of the Oort cloud.
There is that deal with astronomers thinking there might be two objects out there that caused the Kuiper cliff and the orbits of objects in Sednoid region.
>>7652192 >Discovering a planetary sized object between Pluto and the inner Oort cloud Why Pluto out of all KBO? Eris would make more sense since its a lot further out and more massive. The planetary definition is robust enough to survive the discovery of a Mars sized TNO.
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