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Dark matter

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More than three years ago, scientists working with NASA's Chandra X-Ray Observatory announced that they have found direct evidence that dark matter exists in the universe. Dark matter is one of the holy grails of astronomy since little is known about it though theories say it accounts for 90 per cent of the matter of the Universe. In this image, a purple haze shows dark matter flanking the "Bullet Cluster."

PHOTO: NEWSCOM/FILE

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