Which has a cone for its reproductive structure

conifers: Cones

Explanation:

Conifers have cones (hence their name). Cones are the reproductive structures ofthe conifers: Cones are diploid tissue produced by the dominant sporophyte stage. The haploid gametophyte stage develops and produces gametes inside the cone.

Gravity, it helps keeps all the planets/universes in place because they keep it all balanced. They are each pulling each other and that helps that be still. Also, velocity because of the speed that most planets and galaxies are moving. Everything in the world is revolving something else and they are moving causing them to pull each other.