Physics
Dark matter: The evidence
Eighty per cent of the total matter in the cosmos is invisible to conventional telescopes. But if we can't see it, how can we be so sure it's there?
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Eighty per cent of the total matter in the cosmos is invisible to conventional telescopes. But if we can't see it, how can we be so sure it's there?
An optical illusion has enabled the most precise measurement yet of the abundance of dark energy, thought to be accelerating the universe's expansion