Why did gaster fall into the void in undertale?

In "Undertale," Gaster, the former Royal Scientist, fell into the void due to his experiments with the core and the manipulation of time and space. His ambitious research aimed to uncover the secrets of the universe, but it ultimately led to his downfall, causing him to become lost in the void between dimensions. This event is shrouded in mystery and contributes to Gaster's enigmatic presence throughout the game, with players uncovering fragments of his story through hidden lore and dialogue.