NASA’s Webb Redefines Dividing Line Between Planets, Stars

https://science.nasa.gov/missions/webb/nasas-webb-redefines-dividing-line-between-planets-stars/ Planets, like those in our solar system, form in a bottom-up process where small bits of rock and ice clump together and grow larger over time. But the heftier the planet, the harder it is to explain its formation that way.