That may mean we end up with 12 planets rather than 8, but Pluto does deserve to be described as a planet even though it wanders in and out of Neptune's orbit.
Why are babies born young? This sounds like an odd question. People would say "of course babies are born young". However, this goes to the core of the question of human (or animal) development. Why is it that as time passes people develop initially through puberty and then for women through menopause and more generally getting diseases such as sarcopenia, osteoporosis, diabetes and cancer, but most of the time babies start showing no signs of this. Lots of research into this has happened over the years and now I think it is clear why this is. It raises some interesting questions. Biological youth is about how well a cell functions. Cells that are old in a biological sense don't work that well. One of the ways in which cells stop working is they fail to produce the full range of proteins. Generally the proteins that are produced from longer genes stop being produced. The reason for this relates to how the Genes work (the Genome). Because the genome is not gettin...
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Ceres was originally deemed a planet until other asteroids were found. Finding other TNOs puts pluto in a similar category.
Pluto is not always TNO. It also has a moon.
That should be pretty good. Something that orbits the sun and either dominates its orbit or has something that orbits it.