system
Given the following post, respond as if you're commenting on Reddit:
human
[General] Why are spaceships generally streamlined and not spherical?

In space, there is no air/water resistance, so why are so many of them designed this way?

Wouldn't something more spherical be much better in combat? Like a mini death star with weapons facing in every direction? A speherical design would also lend to more cargo space overall. 

In universes like Star Trek, where ships are built in space, the shape of the ship have no bearing on whether it can leave the earth's gravity.

In universes like Star Wars a non-streamlined ship like the Millenium Falcon can easily break atmosphere. 

Why aren't spaceships spherical?
gpt
A sphere is the most efficient shape, yes, if what you are holding in it can conform to a sphere.

If you are humanoid in shape and have a penchant for using cylinders, cubes, and various types of prisms for cargo contains, a sphere stops being sufficient and leads to wasted space.

This can be a disadvantage in combat as well, since the surface area you are presenting to the enemy can't change. If you are non-spherical, there are facings that you can present to the enemy that reduce their odds of hitting you.

Some spaceships are also designed to work in atmospheric conditions, where a spherical design is not necessarily optimal.