Chucky wrote:cheesychips4320 wrote:how did i miss that lol
you can delete this then if you want cos i guess its best to talk about what im going to talk about on that thread
No no, I won't be deleting this. This topic is slightly different than the other one.
'Planet X' turned out to be a Dwarf-Planet, didn't it? What was it called - Eris? Most of these new 'planets' that are found now are just Trans-Neptunian Objects and are dwarf-planets. Their orbits ensure that that cannot be classified as true planets, just like Pluto is no longer a planet.
Kevin
To my knowledge, Planet X was never "found" (and the vast majority of astronomers today believe it does not exist, at least in the form it was orginially thought). The search for Planet X began before the discovery of Pluto, based on observations made of discrepancies in the orbits of the gas giants. When Pluto was discovered, it was believed that it was the Planet X, at least until calculations of its mass showed that it was far too small to affect the orbits of the gas giants. As I understand it, Planet X was believed to have to be very large (certainly
much larger than Pluto). No such object has been found. Updated calculations of Neptune's mass also solved the orbit discrepancies.
However, many Pluto-sized objects have been found far beyond Pluto. Eris and Sedna are just a couple examples and are among the largest. These objects originate in the Kuiper Belt and Oort Cloud of our solar system; Pluto itself is considered a Kuiper Belt object.