10 Biggest Unexplained Mysteries Of The Universe

4. Boötes Void

Aside from a few anomalies, the universe is relatively uniform. Across any region of space, you can more or less predict with decent accuracy how many galaxies there will be in said region.

That being said, there are sections of space where there simply aren't as many galaxies as there should be. These are called voids, just to hammer home the terror that comes with a section of the universe being missing.

Boötes void is one such void that is particularly empty. In an area of space where there should be 2000 galaxies, exists just 60. This is why Boötes void has also been referred to as The Great Nothing.

The reason that this section of space only contains 3% of the matter it should is still unknown, with theories ranging from the merger of smaller voids to create one big void like smaller bubbles combining to become one big bubble, to a huge intergalactic explosion that either destroyed everything or just pushed everything aside.