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The Black Planet is a massive black hole located near the Star of Thundera. It has immense gravitational pull and any thing caught in that pull is drawn towards its center. Once caught in the gravitational field, nothing can escape.
When Jaga sought the help of the Star of Thundera to assist the ThunderCats in rescuing Lynx-O, Bengali, and Pumyra, Grune barred his way. The former ThunderCat knocked Jaga into the gravitational pull of the Black Planet. He might have faced certain doom had it not been for the Star of Thundera which pulled him back to safety.