Astronomers have discovered a massive galaxy made almost entirely of dark matter. Called Dragonfly 44, the galaxy is basically 99.99 percent dark matter.
The two largest pieces of the Universe that we know the least about, yet nothing less than the ultimate fate of the Universe will be determined by them. (Illustration: NASA/CXC/M.Weiss)
From dark energy and string theory to the end of the Universe, these are the unanswered cosmic conundra that are still baffling scientists.
The possible outcomes to the fate of the Universe rest on the 95% of it we have currently no idea about: dark matter and dark energy
Dark Matter and Dark Energy
The second largest component of the universe is dark matter. The truth is, we understand little of what it is, and more of what it is not.
42 Facts About Space, A Homage to Douglas Adams. - Album on Imgur
MessageToEagle.com - "The Most Profound Mystery In All Of Science" - Dark Energy - with video
Einstein may have discovered dark energy without even realizing it
As for me, all the "dark" stuff is bullshit. I do NOT subscribe to these theories. It's all gravity, the forces of electromagnetism and nuclear reactions.