“New results have come in from the Xenon100 experiment, a tub of cryogenically cooled liquid xenon buried 1400 metres down a mine at the Gran Sasso National Laboratory near L’Aquila, Italythat show no sign of WIMPs, or weakly interacting massive particles, the still-theoretical particles thought to make up the invisible majority of the universe’s mass, a direct challenge to physicists who believe dark matter is made up of WIMPs, particles that carry mass but, as their name suggests, rarely interact with other particles. The project’s previous results, presented over a year ago and based on just 100 days of data, came up empty.”

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