Human Interest

Writing prompt: Specify a set of objects to put in motion, have them observe the interactions of the objects, then write to describe. For younger students, supply an observation organizer note sheet. For older students, the descriptions can be as technical as their math understanding will allow. 

It's pretty simple, the bigger the particle is, the bigger it's atmosphere is to allow more gravity. For example, Jupiter is the largest planet which is in favor to Earth. The reason why is because Jupiter uses it's large mass to protect Earth from oncoming meteors and comets. It uses it's large atmosphere to absorb comets and meteors onto Jupiter instead of allowing them to crash onto Earth.