Planets

[whiskeryron]

Space is full of rocks of all shapes & sizes, why are planets all orbit shaped ?

[beso]

Gravity. Having enough mass for the gravity to make the body round is one of the definitions of a planet.

[mibn2cweus]

The bigger an object is the more gravity it has which pulls everything down towards the centre forming a spherical body.

http://curious.astro.cornell.edu/about-us/56-our-solar-system/planets-and-dwarf-planets/general-questions/231-why-are-stars-and-planets-round-beginner

[Old_Geezer]

An orbit is a curved trajectory. Not seen many planets shaped like that.

Planents tend to the sphere shaped because gravity "pulls" in all directions so the bits get deposited roughly equally.

[Canary42]

/// gravity "pulls" in all directions ///

All directions ? That's news to me ;-)