Zacs-Master: "there is no explanation for dark matter. And the more we observe about our universe, the more of a mystery it becomes"
Dark matter & Dark energy are mass and energy that are not visible when observed in telescopes - as sort of invisible mass and energy.
http://www.independent.co.uk/news/science/ghost-galaxy-dark-matter-dragonfly-44-invisible-milky-way-a7209881.html reports, "Scientists have found a “ghost” galaxy – roughly the same mass as our own, but entirely made up of DARK MATTER. Dragonfly 44 is almost entirely made up of dark matter, the mysterious – and for now mostly theoretical – stuff that makes up 27 per cent of the universe but has never actually been seen. Astronomers found out about the strange ghost galaxy by looking at the movement of the galaxy’s stars – movement that seemed to be influenced by matter that doesn’t by normal measures exist. Only 5 per cent of the interchangeable mass-energy of the universe is made up of the kind of normal matter that we can see and touch. Dark matter makes up a large part of the rest. Despite the fact that it constitutes 27 per cent of the universe, it doesn’t reflect light and can’t be seen by any means so far. The remaining part of the universe is made by something even more confusing. DARK ENERGY makes up 68 per cent of the universe, and is a kind of anti-gravitational force that is pushing galaxies apart, more and more quickly".