system
Given the following post, respond as if you're commenting on Reddit:
human
[40k] How big is the Imperium of Man?

So my question is how big is the Imperium of Man in Warhammer 40k?  Roughly how many planets are part of the Imperium and how many people live within the Imperium and how many soldiers does it have?
gpt
**Size?** Spans the whole galaxy. (They do not control the entire galaxy however)

**Planets?** Tens of Millions under their control. 

**Population?** Quadrillions. 

**Soldiers?** Trillions. 

**Space Marines?** At least 1 million.

*Edit*

Thanks Lochdonin for the corrections!