Is Dark Matter the 'Aliens' of Astrophysics?
Ethan Siegel, Forbes
Despite our knowledge of the laws of physics, and the successes of the Standard Model and General Relativity, there are a number of observations out there in the Universe that still lack a complete explanation. From star formation to high-energy cosmic rays, the Universe still has its mysteries. Although we've discovered a great deal about space, we still don't know it all.