A Quasar, solar flares, or galaxies exploding
Antimatter
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. The most explosive variety of volcanic activity would be the caldera-forming eruptions of stratovolcanoes. Cinder cone eruptions are only mildly 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.
a black and white hole
Hasmter are the most adorable thing in the universe
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?