Mysterious of the Universe that are still unsolved
Scientists have found a mysterious matter a few decades earlier. They call this new matter as dark matter. The existence of dark matter is found from the its gravity signature, otherwise there is no evidence.
This matter was found by carefully analyzing the motion of galaxies. It was found that galaxies have strong gravitational field as compared to the visible mass of the matter. So scientists reached on a conclusion that, there must be some mysterious matter that is not interacting with light.
The mystery of dark matter is still a big question mark like many other mysteries of the universe that I found at: http://toptenscience.com/unsolved-mysteries-of-the-universe/
It's pretty interesting that we can observe the effects of dark matter, even though we can't visually see them. We know so much, but yet, so little.
Yes, you're right and there are more than top ten such type of unsolved mysteries and other space related facts at that are worth reading http://toptenscience.com/space/
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