1. Antimatter
Matter and anti-matter annihilate each other when they collide and their mass is converted into pure energy by Einstein's equation E=mc2.

2. Mini-Black Holes
Mini-black holes are primordial leftovers from the Big Bang and affect space-time differently because of their close association with a fifth dimension.

3. Cosmic Microwave Background
Also known as the CMB, this radiation is a primordial leftover from the Big Bang that birthed the universe. It was first detected during the 1960s as a radio noise that seemed to emanate from everywhere in space.

4. Dark Matter
Scientists think it makes up the bulk of matter in the universe, but it can neither be seen nor detected directly using current technologies. Candidates range from light-weight neutrinos to invisible black holes.

5. Exoplanets
Until about the early 1990s, the only known planets in the universe were the familiar ones in our solar system. Astronomers have since identified more than 190 extrasolar planets. They range from gargantuan gas worlds whose masses are just shy of being stars to small, rocky ones orbiting dim, red dwarfs.

6. Gravity Waves
Gravity waves are distortions in the fabric of space-time predicted by Albert Einstein's theory of general relativity. The waves travel at the speed of light, but they are so weak that scientists expect to detect only those created during colossal cosmic events, such as black hole mergers.

7. Galactic Cannibalism
Like life on Earth, galaxies can "eat" each other and evolve over time. The Milky Way's neighbor, Andromeda, is currently dining on one of its satellites. More than a dozen star clusters are scattered throughout Andromeda, the cosmic remains of past meals.

8. Neutrinos
Neutrinos are electrically neutral, virtually mass-less elementary particles that can pass through miles of lead unhindered. Some are passing through your body as you read this. These "phantom" particles are produced in the inner fires of burning, healthy stars as well as in the supernova explosions of dying stars.

9. Quasars
These bright beacons shine to us from the edges of the visible universe and are reminders to scientists of our universe's chaotic infancy. Quasars release more energy than hundreds of galaxies combined. The general consensus is that they are monstrous black holes in the hearts of distant galaxies.

10. Vacuum Energy
Quantum physics tells us that contrary to appearances, empty space is a bubbling brew of "virtual" subatomic particles that are constantly being created and destroyed. The fleeting particles endow every cubic centimeter of space with a certain energy that, according to general relativity, produces an anti-gravitational force that pushes space apart.

Originally posted by SuperSlovak
I would hate to run into a quasar in my travels!!! One of those things has the energy of hundreds of galaxies wow I bet it could do some serious damage!