Like Consciousness: Even though dark matter is invisible, astrophysicists know it exists. Without this dark matter it is impossible to explain how the visible things in the universe hang together

Link: http://news360.com/web/#article/168346709?category=11 (sent via Shareaholic)

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 Even though dark matter is invisible, astrophysicists know it exists. Without this dark matter it is impossible to explain how the visible things in the universe hang together