Jupiter

a may have prevented asteroids from forming a planet
b has a large gravitational field which can capture small comets
c is responsible for creating most known meteors and meteoroids
d releases radiation which warms comets and creates a comet tail

mountains can affect the climate of nearby lands. in some areas, mountains block rain, so that one side of a mountain range may be rainy and the other side may be a desert. much of airborne moisture falls as rain on the windward side of mountains.

explanation:

this would be a math