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What's the proof for presence of dark energy?

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Rubin estimated that the galaxies must contain about six times more mass than what could be observed with existing instruments. Forty years later, despite extensive efforts, scientists haven't found a fundamental dark-matter particle or any evidence of what makes up the mysterious substance. read more

Dark energy is somewhere related to the dark matter. The example of dark matter is the galaxies of coma cluster revolving around an uncertain invisible point which has its own mass and a huge gravitation force. read more

Dark energy is the name given to a strange entity that appears to make up most of the mass-energy density of our Universe. This mysterious 'energy' is pushing apart our Universe, and its identity appears to be at least as elusive as that of dark matter. Evidence for dark energy comes from multiple sources. read more

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