There are few beings in the Marvel Universe more powerful than Galactus and Ghost Rider, as one is a cosmic entity older than the universe itself whose entire purpose is to consume planets, and the other is a demonic powerhouse who has yet to face anyone that poses a genuine threat to him (in his weakest state, no less). Therefore, the prospect of these two fighting each other is beyond exciting, and will stand as Marvels ultimate cosmic face-off.
https://screenrant.com/galactus-vs-ghost-rider-ultimate-cosmic-battle-marvel/