A shadow cosmos, woven silently into our own, may have its own rich inner life
On September 23, 1846, Johann Gottfried Galle, Director of the Berlin Observatory, received a letter that would change the course of astronomical history. It came from a Frenchman, Urbain Le Verrier, who had been studying the motion of Uranus and concluded that its path could not be explained by the known gravitational forces acting on it. Le Verrier suggested the existence of a hitherto unobserved object whose gravitational pull was perturbing Uranus's orbit in precisely the way required to account for the anomalous observations. Following Le Verrier's directions, Galle went to his telescope that night and discovered the planet Neptune.
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Can dark matter and dark energy be considered a overlapping parallel universe? | Yahoo Answers
You have to remember that these things have never been observed: they are strictly science fiction. Scientists tell us that 96% of the universe is dark matter. If that were true, observations would be irrelevant.