The Cosmic Anisotropy Telescope (CAT) was a three-element interferometer for cosmic microwave background radiation (CMB/R) observations at 13 to 17 GHz, based at the Mullard Radio Astronomy Observatory.

In 1995, it was the first instrument to measure small-scale structure in the cosmic microwave background.

When the more sensitive Very Small Array came online, the CAT telescope was decommissioned in a ceremonial bonfire.

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