Black hole

"♫ Black hole sun, won't you come ♫
♫ And wash away the rain ♫
♫ Black Hole Sun, won't you come... ♫
♫ Won't you coooooome... ♫"

―Black Hole Song

A black hole is the ultimate in galactic garbage pails. These phenomena were especially concentrated in an area known as the Maw, visible only due to the ionizing gasses being sucked into their greedy, high-gravity mouths (not even light could escape). They were hazards to hyperspace navigation, but also made for excellent trash compactors.

The Yuuzhan Vong used black holes as power sources. See, there were these creatures called dovin basals that generated their own gravitic singularities... because that can happen... and that generated power somehow, instead of sucking everything inside it. Shut up! Because we said so, that's why!