A Quasar, solar flares, or galaxies exploding
Perhaps you are confusing Universe with galaxy. Most galaxies have a black hole in their center. The Universe has no such thing as a center.
the universe itself
Explosive volcanoes are most common at subduction zones.
Mount St. Helens is generally regarded as an explosive volcano, but like most stratovolcanoes, it can produce both explosive and non-explosive eruptions.
No. Volcanic eruptions in Hawaii are not usually explosive.
Antimatter
A Super Nova, exploding star, is by far the most destructive thing in the universe.
The Big Bang went Kaboom!
Life
The unknown.
Hasmter are the most adorable thing in the universe
a black and white hole
Duuh The Universe
Perhaps you are confusing Universe with galaxy. Most galaxies have a black hole in their center. The Universe has no such thing as a center.
Hydrogen: stars universes every thing has it
Most likely by firing explosive pots out of catapults. The mirrors thing is a myth
An organism is a living thing. Is the universe a living thing?