Growing up you would learn the different planets that make up our solar system. from the gas planets to the core planets. we have a total number of 7 excluding Pluto that many scientists have proven it could be a dwarf planet of maybe can fit in our circle of planets. most fortunate possibility is that we might even have a second planet that could be able to withstand life like or even better than Earth
"Maybe this world is another planet's hell" -aldous Huxley