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cosmicpower:

“If they have a real signal, it’s a seriously big deal. The scale on which people are looking for dark matter is vast,” said Gerry Gilmore at Cambridge University’s institute of astronomy. “Dark matter is what created the structure of the universe and is essentially what holds it together. When ordinary matter falls into lumps of dark matter it turns into galaxies, stars, planets and people. Without it, we wouldn’t be here,” Gilmore said.

Scientists have debated the existence of dark matter since 1933, when the Swiss astronomer Fritz Zwicky argued that a distant cluster of galaxies would fall apart were it not for the gravitational pull of some vast but invisible cosmic substance. It was named dark matter because it does not reflect or absorb light, making it impossible to observe with telescopes.