well yeah, but pluto was about the same size as Eris, prompting the addition of a dwarf planet classification and pluto/charons subsequent reclassification.
All this gravity stuff is super interesting though. I mean you think about it humans are weightless in space, but not really, just so infintesimally small as to ecperience essential weightlessness. In reality gravity is constant and everywhere pulling in all sorts of directions. The sun creates a massive gravity field reaching out far more than a thousand AU. On the galactic disc it even bobs up and down and when it passes through the center it and the gravity wells of all the other nearby stars effect one another and their systems. The entire milky way is the product of a humungeous gravity field holding it all together forcing everything within a billion lightyear area to revolve around the galactic core. And then theres the fact that all the galaxies in our local area are also in motion as well, they usually say they'r being pulled, by what they don't know, but theres something else out there making an even more massive gravity field than the Milky Way black hole and core stars. When you think about it, all this stuff has eight too, they must have some special unit to measure and calculate the weight of celestial objects.