The Phantom Zone?
The Dark Dimension (darkforce powers)?
The Dark Dimension (Dormammu)?
Surtur's realm?
Mephisto's Hell?
The Microverse?
The Negative Zone?
The Speed Force?
Not sure how his powers work outside of planet draining.
On the other hand, Galactus CANNOT consume something as simple as e.g. stars or solar energy. His primary source of energy is the biospheres of planets; other than that it's a hit-or-miss.
I think Galactus can consume almost any energy source(he could not consume the dark Galaxy in rom#27).I think he gets the most energy from planets that are capable of life.But he can consume stars and other things,but at different %.
Wrong, it has been well established in canon that Galactus cannot consume stars. Just before he ate the Skrull homeworld he was desperately looking for an alternative so that no more civilizations would have to die by his hand. He tried his best to devour solar energy... and failed.
Then Death appeared to him, and convinced him that it is his role to devour life and that he should just accept it.
This is a scan where Galactus tries to consume stellar energy, and the next page he fails miserably at it (unfortunately I was unable to find the follow-up scan) :
As far as I know Galactus could potentially eat -everything-, so a definite yes on everything except maybe the speed-force and anything that's not necessarily a place but more of an abstract concept.
I'm not sure if he could eat mistress love or the lords of chaos and order.
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he can certainly consume stars--what is inconsistent is whether he can gain any power from doing it. logically, he should be able to. we also don't know if he was gaining power from devouring mephisto's world. it's the nourishment he gains that is the issue. he did actually FAIL to devour wraithworld and its black sun--the wraiths were a race of dark sorcerers. that leads me to think he likely couldn't consume dark force energy. not sure he could devour dormmy's realm either. he also had a lot of problems when he tried to consume the elders, but that was because death denied them entrance to her realm, iirc. not sure that would be a replicable situation in this thread.