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The Australia Telescope Compact Array is made of 6 dishes that can be placed such that the array is up to 6 km across. Five of the dishes (shown here) move along a 3-km rail track in the eat-west direction and also along a 230-meter north-south track. The sixth anntenna (not shown) is situated a further 3 km west of the main track. Arrays of telescopes are used to achieve the equivalent resolution (clarity) of a single large telescope, so the Compact Array could have the resolving power of a telescope 6-km in diameter (i.e., very high resolution!).