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| Location(s) | United Kingdom |
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| Coordinates | 52°09′58″N 0°02′02″E / 52.166°N 0.034°E |
| Telescope style | cosmic microwave background experiment radio telescope  |
  Location of Cosmic Anisotropy Telescope | |
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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.