The current IAU definition of planet is now 20 years old, and in that time, we've learned a whole lot more about moons and dwarf planets. Here's why they should be planets, toohttps://bigthink.com/starts-with-a-bang/science-pluto-become-planet-again/?utm_source=fark&utm_medium=website&utm_content=link&utm_campaign=fark&ICID=ref_fark#stem #science #space #astronomy #astrophysics #astrobiology #interesting