Why is a monolithic Dyson sphere impossible?

[HystereeSis]

Specifically a monolithic Dyson Sphere; also, how would a Dyson Swarm work / be a better option?

 

[russ_watters]

Is the existence of a Dyson Sphere impossible?

Not specifically, no.

also, how would a Dyson Swarm work / be a better option?

Better option for what?

Is this a science fiction question?

 

[mfb]

A monolithic Dyson sphere without moving parts wouldn't be possible with materials we know, but in principle you can stabilize it with fast-moving (faster than orbital velocity) components.

 

[bob012345]

Perhaps one could make a Dyson Balloon inflated by solar radiation pressure around a star but there would have to be some sort of active control to keep the balloon centered around the star by manipulating the surface transmission/reflection coefficients to compensate for drift so it would amount to a leaky Dyson sphere. Of course one could not build structures on such a surface but it might go a long way towards Dyson's goal of using all (or most) of the star's energy and making the star less detectable to outside civilizations.